256921074 has 12 divisors (see below), whose sum is σ = 556662366. Its totient is φ = 85640352.

The previous prime is 256921069. The next prime is 256921099. The reversal of 256921074 is 470129652.

256921074 is a `hidden beast` number, since 2 + 569 + 21 + 0 + 74 = 666.

It can be written as a sum of positive squares in only one way, i.e., 254625849 + 2295225 = 15957^2 + 1515^2 .

It is an alternating number because its digits alternate between even and odd.

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 7136679 + ... + 7136714.

Almost surely, 2^256921074 is an apocalyptic number.

256921074 is an abundant number, since it is smaller than the sum of its proper divisors (299741292).

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

256921074 is a wasteful number, since it uses less digits than its factorization.

256921074 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 14273401 (or 14273398 counting only the distinct ones).

The product of its (nonzero) digits is 30240, while the sum is 36.

The square root of 256921074 is about 16028.7577185507. The cubic root of 256921074 is about 635.7210269321.

The spelling of 256921074 in words is "two hundred fifty-six million, nine hundred twenty-one thousand, seventy-four".