256542868 has 12 divisors (see below), whose sum is σ = 449173620. Its totient is φ = 128207552.

The previous prime is 256542857. The next prime is 256542893. The reversal of 256542868 is 868245652.

It can be written as a sum of positive squares in 2 ways, for example, as 13557124 + 242985744 = 3682^2 + 15588^2 .

It is a congruent number.

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, 6283 + ... + 23506.

It is an arithmetic number, because the mean of its divisors is an integer number (37431135).

Almost surely, 2^256542868 is an apocalyptic number.

It is an amenable number.

256542868 is a deficient number, since it is larger than the sum of its proper divisors (192630752).

256542868 is a wasteful number, since it uses less digits than its factorization.

256542868 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 31946 (or 31944 counting only the distinct ones).

The product of its digits is 921600, while the sum is 46.

The square root of 256542868 is about 16016.9556408201. The cubic root of 256542868 is about 635.4089316286.

The spelling of 256542868 in words is "two hundred fifty-six million, five hundred forty-two thousand, eight hundred sixty-eight".