256720625288 has 32 divisors (see below), whose sum is σ = 482826511800. Its totient is φ = 127967059968.

The previous prime is 256720625281. The next prime is 256720625311. The reversal of 256720625288 is 882526027652.

It can be written as a sum of positive squares in 4 ways, for example, as 180300445924 + 76420179364 = 424618^2 + 276442^2 .

It is not an unprimeable number, because it can be changed into a prime (256720625281) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 17142668 + ... + 17157636.

Almost surely, 2^256720625288 is an apocalyptic number.

It is an amenable number.

256720625288 is a deficient number, since it is larger than the sum of its proper divisors (226105886512).

256720625288 is a wasteful number, since it uses less digits than its factorization.

256720625288 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 21401 (or 21397 counting only the distinct ones).

The product of its (nonzero) digits is 6451200, while the sum is 53.

The spelling of 256720625288 in words is "two hundred fifty-six billion, seven hundred twenty million, six hundred twenty-five thousand, two hundred eighty-eight".