287865 has 12 divisors (see below), whose sum is σ = 499044. Its totient is φ = 153504.

The previous prime is 287863. The next prime is 287867. The reversal of 287865 is 568782.

287865 is digitally balanced in base 7, because in such base it contains all the possibile digits an equal number of times.

It is an interprime number because it is at equal distance from previous prime (287863) and next prime (287867).

It can be written as a sum of positive squares in 2 ways, for example, as 36864 + 251001 = 192^2 + 501^2 .

It is not a de Polignac number, because 287865 - 2¹ = 287863 is a prime.

It is a Smith number, since the sum of its digits (36) coincides with the sum of the digits of its prime factors.

287865 is strictly pandigital in base 7.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 287865.

It is not an unprimeable number, because it can be changed into a prime (287863) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 3154 + ... + 3243.

It is an arithmetic number, because the mean of its divisors is an integer number (41587).

2²⁸⁷⁸⁶⁵ is an apocalyptic number.

It is an amenable number.

287865 is a deficient number, since it is larger than the sum of its proper divisors (211179).

287865 is a wasteful number, since it uses less digits than its factorization.

287865 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6408 (or 6405 counting only the distinct ones).

The product of its digits is 26880, while the sum is 36.

The square root of 287865 is about 536.5305210331. The cubic root of 287865 is about 66.0282248426.

The spelling of 287865 in words is "two hundred eighty-seven thousand, eight hundred sixty-five".