287

287 is a natural number that follows 286 and precedes 288. It is used in mathematical contexts as a simple three-digit identifier and in general counting.

In mathematics, 287 is an odd composite number. Its prime factorization is 7 × 41, making it a semiprime (the product of two primes). It has four positive divisors: 1, 7, 41, and 287. It is not a prime, not a perfect square, and it is congruent to 3 modulo 4.

In numeral representations, 287 is written as CCLXXXVII in Roman numerals. In binary it is 100011111, and in hexadecimal it is 0x11F.

In calendar terms, 287 is the 287th day of the year in a common year, which falls on October 14. In a leap year, the 287th day falls on October 13.

Beyond these properties, 287 appears as a general numeric designation in various systems, including catalogs, route numbers, and model identifiers, where three-digit numbers are commonly used for organizational purposes.