256351564 has 12 divisors (see below), whose sum is σ = 512703184. Its totient is φ = 109864944.

The previous prime is 256351549. The next prime is 256351609. The reversal of 256351564 is 465153652.

256351564 is an admirable number.

It is a super-2 number, since 2×256351564² = 131432248730492192, which contains 22 as substring.

It is a hoax number, since the sum of its digits (37) coincides with the sum of the digits of its distinct prime factors.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 4577679 + ... + 4577734.

Almost surely, 2^256351564 is an apocalyptic number.

It is an amenable number.

256351564 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

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

256351564 is a wasteful number, since it uses less digits than its factorization.

256351564 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9155424 (or 9155422 counting only the distinct ones).

The product of its digits is 108000, while the sum is 37.

The square root of 256351564 is about 16010.9826056991. The cubic root of 256351564 is about 635.2509508870.

The spelling of 256351564 in words is "two hundred fifty-six million, three hundred fifty-one thousand, five hundred sixty-four".