256624 has 20 divisors (see below), whose sum is σ = 510136. Its totient is φ = 124992.

The previous prime is 256609. The next prime is 256639. The reversal of 256624 is 426652.

It is an interprime number because it is at equal distance from previous prime (256609) and next prime (256639).

It is a congruent number.

It is an unprimeable number.

256624 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 3 ways as a sum of consecutive naturals, for example, 502 + ... + 874.

2²⁵⁶⁶²⁴ is an apocalyptic number.

It is an amenable number.

256624 is a deficient number, since it is larger than the sum of its proper divisors (253512).

256624 is a wasteful number, since it uses less digits than its factorization.

256624 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 424 (or 418 counting only the distinct ones).

The product of its digits is 2880, while the sum is 25.

The square root of 256624 is about 506.5806944604. The cubic root of 256624 is about 63.5475907523.

It can be divided in two parts, 25 and 6624, that multiplied together give a triangular number (165600 = T₅₇₅).

The spelling of 256624 in words is "two hundred fifty-six thousand, six hundred twenty-four".