256972256 has 24 divisors (see below), whose sum is σ = 518256144. Its totient is φ = 125351680.

The previous prime is 256972231. The next prime is 256972291. The reversal of 256972256 is 652279652.

It is a congruent number.

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 in 3 ways as a sum of consecutive naturals, for example, 96620 + ... + 99243.

It is an arithmetic number, because the mean of its divisors is an integer number (21594006).

Almost surely, 2^256972256 is an apocalyptic number.

It is an amenable number.

256972256 is an abundant number, since it is smaller than the sum of its proper divisors (261283888).

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

256972256 is a wasteful number, since it uses less digits than its factorization.

256972256 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 195914 (or 195906 counting only the distinct ones).

The product of its digits is 453600, while the sum is 44.

The square root of 256972256 is about 16030.3542069413. The cubic root of 256972256 is about 635.7632387454.

The spelling of 256972256 in words is "two hundred fifty-six million, nine hundred seventy-two thousand, two hundred fifty-six".