287665 has 8 divisors (see below), whose sum is σ = 394560. Its totient is φ = 197232.

The previous prime is 287629. The next prime is 287669. The reversal of 287665 is 566782.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 287665 - 2⁷ = 287537 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 287665.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 287665.

It is not an unprimeable number, because it can be changed into a prime (287669) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 4075 + ... + 4144.

It is an arithmetic number, because the mean of its divisors is an integer number (49320).

2²⁸⁷⁶⁶⁵ is an apocalyptic number.

It is an amenable number.

287665 is a deficient number, since it is larger than the sum of its proper divisors (106895).

287665 is an equidigital number, since it uses as much as digits as its factorization.

287665 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8231.

The product of its digits is 20160, while the sum is 34.

The square root of 287665 is about 536.3441059618. The cubic root of 287665 is about 66.0129298206.

The spelling of 287665 in words is "two hundred eighty-seven thousand, six hundred sixty-five".