256624188 has 12 divisors (see below), whose sum is σ = 598789800. Its totient is φ = 85541392.

The previous prime is 256624177. The next prime is 256624189. The reversal of 256624188 is 881426652.

It is a tau number, because it is divible by the number of its divisors (12).

It is a Smith number, since the sum of its digits (42) coincides with the sum of the digits of its prime factors.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (256624189) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 10692663 + ... + 10692686.

It is an arithmetic number, because the mean of its divisors is an integer number (49899150).

Almost surely, 2^256624188 is an apocalyptic number.

It is an amenable number.

256624188 is an abundant number, since it is smaller than the sum of its proper divisors (342165612).

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

256624188 is a wasteful number, since it uses less digits than its factorization.

256624188 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 21385356 (or 21385354 counting only the distinct ones).

The product of its digits is 184320, while the sum is 42.

The square root of 256624188 is about 16019.4939994995. The cubic root of 256624188 is about 635.4760627037.

The spelling of 256624188 in words is "two hundred fifty-six million, six hundred twenty-four thousand, one hundred eighty-eight".