256565260 has 48 divisors (see below), whose sum is σ = 619589376. Its totient is φ = 87417792.

The previous prime is 256565251. The next prime is 256565279. The reversal of 256565260 is 62565652.

It is a Smith number, since the sum of its digits (37) coincides with the sum of the digits of its prime factors.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 17199 + ... + 28441.

It is an arithmetic number, because the mean of its divisors is an integer number (12908112).

Almost surely, 2^256565260 is an apocalyptic number.

256565260 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 256565260, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (309794688).

256565260 is an abundant number, since it is smaller than the sum of its proper divisors (363024116).

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

256565260 is a wasteful number, since it uses less digits than its factorization.

256565260 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11422 (or 11420 counting only the distinct ones).

The product of its (nonzero) digits is 108000, while the sum is 37.

The square root of 256565260 is about 16017.6546348084. The cubic root of 256565260 is about 635.4274180294.

It can be divided in two parts, 256 and 565260, that added together give a triangular number (565516 = T₁₀₆₃).

The spelling of 256565260 in words is "two hundred fifty-six million, five hundred sixty-five thousand, two hundred sixty".