256403504 has 40 divisors (see below), whose sum is σ = 581608608. Its totient is φ = 107205120.

The previous prime is 256403501. The next prime is 256403513. The reversal of 256403504 is 405304652.

It is not an unprimeable number, because it can be changed into a prime (256403501) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 23327 + ... + 32510.

Almost surely, 2^256403504 is an apocalyptic number.

It is an amenable number.

256403504 is an abundant number, since it is smaller than the sum of its proper divisors (325205104).

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

256403504 is a wasteful number, since it uses less digits than its factorization.

256403504 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 55893 (or 55887 counting only the distinct ones).

The product of its (nonzero) digits is 14400, while the sum is 29.

The square root of 256403504 is about 16012.6045351779. The cubic root of 256403504 is about 635.2938512250.

The spelling of 256403504 in words is "two hundred fifty-six million, four hundred three thousand, five hundred four".