256156688 has 20 divisors (see below), whose sum is σ = 496982700. Its totient is φ = 127903104.

The previous prime is 256156679. The next prime is 256156717. The reversal of 256156688 is 886651652.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 84860944 + 171295744 = 9212^2 + 13088^2 .

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, 1538 + ... + 22686.

It is an arithmetic number, because the mean of its divisors is an integer number (24849135).

Almost surely, 2^256156688 is an apocalyptic number.

It is an amenable number.

256156688 is a deficient number, since it is larger than the sum of its proper divisors (240826012).

256156688 is a wasteful number, since it uses less digits than its factorization.

256156688 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 21914 (or 21908 counting only the distinct ones).

The product of its digits is 691200, while the sum is 47.

The square root of 256156688 is about 16004.8957509882. The cubic root of 256156688 is about 635.0899395205.

The spelling of 256156688 in words is "two hundred fifty-six million, one hundred fifty-six thousand, six hundred eighty-eight".