257320028864 has 28 divisors (see below), whose sum is σ = 510635554800. Its totient is φ = 128655952128.

The previous prime is 257320028851. The next prime is 257320028897. The reversal of 257320028864 is 468820023752.

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, 3844517 + ... + 3910875.

It is an arithmetic number, because the mean of its divisors is an integer number (18236984100).

Almost surely, 2^257320028864 is an apocalyptic number.

It is an amenable number.

257320028864 is a deficient number, since it is larger than the sum of its proper divisors (253315525936).

257320028864 is an equidigital number, since it uses as much as digits as its factorization.

257320028864 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 126960 (or 126950 counting only the distinct ones).

The product of its (nonzero) digits is 1290240, while the sum is 47.

The spelling of 257320028864 in words is "two hundred fifty-seven billion, three hundred twenty million, twenty-eight thousand, eight hundred sixty-four".