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Eighty-seven or “87” is a number that can be easily written and spelled out in English. Representing a combination of the digits 8 and 7, it is often used in various contexts such as mathematics, finance, and everyday counting. Eighty-seven is an odd number, positioned between 86 and 88. In terms of its mathematical properties, it is a prime number, meaning it is only divisible by 1 and itself. Additionally, when represented in Roman numerals, 87 is denoted as LXXXVII. This blog provides clear instructions on how to spell 87 in words, along with solved examples and an exploration of its mathematical properties.
Table of Contents
What is 87?
Eighty-seven is a natural number that comes after 86 and before 88. It is represented as 87 in standard numeral form and spelled out as “eighty-seven” in English. Mathematically, it is an odd and composite number with prime factors of 3 and 29. In Roman numerals, it is written as LXXXVII. Its significance extends to various fields, including mathematics, where it has distinct properties like being non-divisible by 2, and in science, where it corresponds to the atomic number of francium.
Eighty-seven is a natural number that follows 86 and precedes 88. Here are its properties:
- Standard Form: 87
- Word Form: Eighty-seven
- Roman Numerals: LXXXVII
- Binary Form: 1010111
- Hexadecimal Form: 57
- Odd Number: 87 is an odd number, meaning it is not divisible by 2.
- Composite Number: 87 is a composite number, meaning it has divisors other than 1 and itself. Its divisors are 1, 3, 29, and 87.
- Prime Factorization: 87 can be factored into prime numbers as 3 × 29.
- Divisors: 1, 3, 29, 87
- Sum of Divisors: 120 (including 87 itself)
87 in Words in English
Eighty-seven in words in English is written as eighty-seven. Some important properties related to 87 are:
| Property | Answer | Explanation |
| Even number | No | 87 is not divisible by 2, hence it is not an even number. |
| Odd number | Yes | 87 is not divisible by 2, hence it is an odd number. |
| Perfect square | No | The square root of 87 is approximately 9.327, not an integer. |
| Perfect cube | No | The cube root of 87 is approximately 4.431, not an integer. |
| Prime number | No | 87 has divisors other than 1 and itself (1, 3, 29, and 87). |
| Composite number | Yes | 87 has more than two divisors, making it a composite number. |
| Sum of digits | 15 | The sum of the digits (8 + 7) is 15. |
| Roman numeral | LXXXVII | 87 is represented as LXXXVII in Roman numerals. |
| Binary form | 1010111 | In binary, 87 is written as 1010111. |
| Hexadecimal form | 57 | In hexadecimal, 87 is written as 57. |
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How to Convert 87 in Words?
Steps to convert 87 in words are mentioned here:
- Tens Place: The number 8 in the tens place tells us we have eight “tens.” In English, we don’t say “eight tens,” but instead use the word “eighty.”
- Ones Place: The number 7 in the ones place tells us we have seven ones. We simply say “seven.”
- Combining: Now, we put these two parts together with a space in between. So, 87 written in words is “eighty-seven.”
Solved Examples on 87 in Words
Q1. What is the sum of sixty-four and twenty-three?
- Given numbers: 64 and 23.
- Sum: 64 + 23 = 87.
- Answer: Therefore, the sum of sixty-four and twenty-three is “eighty-seven.”
Q2. What is the product of twenty-nine multiplied by three?
- Given expression: 29 * 3.
- Product: 29 * 3 = 87.
- Answer: So, the product of twenty-nine multiplied by three is “eighty-seven.”
Q3. If you have seventy-seven books and someone gives you ten more, how many do you have in total?
- Total: 77 + 10 = 87.
- Answer: Hence, the total number of books after receiving ten more to seventy-seven is “eighty-seven.”
Q4. What is the difference between ninety-seven and ten?
- Given numbers: 97 and 10.
- Difference: 97 – 10 = 87.
- Answer: Therefore, the difference between ninety-seven and ten is “eighty-seven.”
Q5. If you have ninety-one coins and you lose four, how many do you have left?
- Remaining: 91 – 4 = 87.
- Answer: Hence, the number of coins left after losing four from ninety-one is “eighty-seven.”
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77 to 90 Numbers in Words
Here is a table that shows the numbers from 77 to 90 written out in words.
| Number | In Words |
| 77 | Seventy-Seven |
| 78 | Seventy-Eight |
| 79 | Seventy-Nine |
| 80 | Eighty |
| 81 | Eighty-One |
| 82 | Eighty-Two |
| 83 | Eighty-Three |
| 84 | Eighty-Four |
| 85 | Eighty-Five |
| 86 | Eighty-Six |
| 87 | Eighty-Seven |
| 88 | Eighty-Eight |
| 89 | Eighty-Nine |
| 90 | Ninety |
FAQs
Eighty-seven.
Odd. Even numbers are divisible by 2, and 87 leaves a remainder of 1 when divided by 2.
No. Prime numbers are only divisible by 1 and themselves. 87 can be divided by 3 (29 x 3).
This depends on your area of interest! In chemistry, Francium (Fr) has an atomic number of 87. Musically, there are 87 keys on a standard piano including the black and white keys.
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