256628992 has 18 divisors (see below), whose sum is σ = 512256038. Its totient is φ = 128314368.

The previous prime is 256628987. The next prime is 256629089. The reversal of 256628992 is 299826652.

It can be written as a sum of positive squares in only one way, i.e., 250398976 + 6230016 = 15824^2 + 2496^2 .

256628992 is a modest number, since divided by 628992 gives 256 as remainder.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 500973 + ... + 501484.

Almost surely, 2^256628992 is an apocalyptic number.

It is an amenable number.

256628992 is a deficient number, since it is larger than the sum of its proper divisors (255627046).

256628992 is an equidigital number, since it uses as much as digits as its factorization.

256628992 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1002473 (or 1002459 counting only the distinct ones).

The product of its digits is 933120, while the sum is 49.

The square root of 256628992 is about 16019.6439411118. The cubic root of 256628992 is about 635.4800280456.

The spelling of 256628992 in words is "two hundred fifty-six million, six hundred twenty-eight thousand, nine hundred ninety-two".