odd, composite · 87th positive integer
The number 87
87 is an odd composite number. It is the 87th positive integer.
Quick reference
| Prime factorization | 3 × 29 |
| Divisors | 1, 3, 29, 87 |
| Binary | 1010111 |
| Hexadecimal | 0x57 |
| Roman numeral | LXXXVII |
| Digit sum | 15 |
| Properties | odd, composite |
Reading 87 in NumGrid context
The 87 record above pulls directly from classical number theory plus NumGrid solver-derived puzzle statistics. What follows is the per-entity context — how 87 sits in the broader integer properties and number-guessing puzzles distribution and which underlying factors drive the headline numbers.
The methodology behind every numeric value on this page is publicly documented on the classical number theory plus NumGrid solver-derived puzzle statistics portal and described in detail on this site’s methodology page. Refresh cadence varies by underlying series; the page surfaces the as-of date for each number so readers can trace any figure back to the source release.
For readers using this page as a decision input, the related-entity pages elsewhere on the site provide the comparison set. The most useful comparison for 87 is typically a peer within positive integers within the NumGrid target pool with similar size, similar exposure, or similar geography — not the national-level summary alone.
Frequently asked
Is 87 a prime number?
No. 87 is composite. Its prime factorization is 3 × 29.
What are the factors of 87?
The factors (divisors) of 87 are 1, 3, 29, 87.
What is 87 in binary?
87 in binary is 1010111. In hexadecimal it's 57.
What is 87 as a Roman numeral?
87 in Roman numerals is LXXXVII.
What's the digit sum of 87?
Adding the digits of 87: 8 + 7 = 15.