255864 has 32 divisors (see below), whose sum is σ = 731520. Its totient is φ = 73056.

The previous prime is 255859. The next prime is 255869. The reversal of 255864 is 468552.

It is an interprime number because it is at equal distance from previous prime (255859) and next prime (255869).

It is a congruent number.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 255864.

It is not an unprimeable number, because it can be changed into a prime (255869) by changing a digit.

255864 is an untouchable number, because it is not equal to the sum of proper divisors of any number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 594 + ... + 929.

It is an arithmetic number, because the mean of its divisors is an integer number (22860).

2²⁵⁵⁸⁶⁴ is an apocalyptic number.

255864 is a gapful number since it is divisible by the number (24) formed by its first and last digit.

It is an amenable number.

255864 is an abundant number, since it is smaller than the sum of its proper divisors (475656).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

255864 is a wasteful number, since it uses less digits than its factorization.

255864 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1539 (or 1535 counting only the distinct ones).

The product of its digits is 9600, while the sum is 30.

The square root of 255864 is about 505.8300109721. The cubic root of 255864 is about 63.4847959962.

The spelling of 255864 in words is "two hundred fifty-five thousand, eight hundred sixty-four".