287 is the natural number following 286 and preceding 288.

In mathematics

  • 287 is an odd composite number with 2 prime factors, namely 7 and 41. This makes it a semiprime.
  • 287 is the sum of consecutive primes in three different ways, 89+97+101, 43+53+59+61+67, and 17+19+23+29+31+37+41+43+47
  • 287 is a pentagonal number which follows the concept of triangular numbers.
  • 287 is the sum of exactly 4 nonzero squares.
  • 287 is a number where 6(287)-1 and 6(287)+1 are both prime.