256081568 has 24 divisors (see below), whose sum is σ = 514890432. Its totient is φ = 125315776.

The previous prime is 256081549. The next prime is 256081597. The reversal of 256081568 is 865180652.

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, 83630 + ... + 86637.

It is an arithmetic number, because the mean of its divisors is an integer number (21453768).

Almost surely, 2^256081568 is an apocalyptic number.

It is an amenable number.

256081568 is an abundant number, since it is smaller than the sum of its proper divisors (258808864).

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

256081568 is a wasteful number, since it uses less digits than its factorization.

256081568 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 170324 (or 170316 counting only the distinct ones).

The product of its (nonzero) digits is 115200, while the sum is 41.

The square root of 256081568 is about 16002.5487969886. The cubic root of 256081568 is about 635.0278517141.

The spelling of 256081568 in words is "two hundred fifty-six million, eighty-one thousand, five hundred sixty-eight".