256317879264 has 24 divisors (see below), whose sum is σ = 672834433320. Its totient is φ = 85439293056.

The previous prime is 256317879217. The next prime is 256317879271. The reversal of 256317879264 is 462978713652.

It is a tau number, because it is divible by the number of its divisors (24).

It is a junction number, because it is equal to n+sod(n) for n = 256317879198 and 256317879207.

It is a congruent number.

It is an unprimeable number.

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 3 ways as a sum of consecutive naturals, for example, 1334988859 + ... + 1334989050.

It is an arithmetic number, because the mean of its divisors is an integer number (28034768055).

Almost surely, 2^256317879264 is an apocalyptic number.

256317879264 is a gapful number since it is divisible by the number (24) formed by its first and last digit.

It is an amenable number.

256317879264 is an abundant number, since it is smaller than the sum of its proper divisors (416516554056).

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

256317879264 is a wasteful number, since it uses less digits than its factorization.

256317879264 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2669977922 (or 2669977914 counting only the distinct ones).

The product of its digits is 30481920, while the sum is 60.

The spelling of 256317879264 in words is "two hundred fifty-six billion, three hundred seventeen million, eight hundred seventy-nine thousand, two hundred sixty-four".