256431884 has 6 divisors (see below), whose sum is σ = 448755804. Its totient is φ = 128215940.

The previous prime is 256431883. The next prime is 256431947. The reversal of 256431884 is 488134652.

256431884 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a super-2 number, since 2×256431884² = 131514622263578912, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (256431883) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 32053982 + ... + 32053989.

It is an arithmetic number, because the mean of its divisors is an integer number (74792634).

Almost surely, 2^256431884 is an apocalyptic number.

It is an amenable number.

256431884 is a deficient number, since it is larger than the sum of its proper divisors (192323920).

256431884 is a wasteful number, since it uses less digits than its factorization.

256431884 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 64107975 (or 64107973 counting only the distinct ones).

The product of its digits is 184320, while the sum is 41.

The square root of 256431884 is about 16013.4906875422. The cubic root of 256431884 is about 635.3172895089.

The spelling of 256431884 in words is "two hundred fifty-six million, four hundred thirty-one thousand, eight hundred eighty-four".