256644260 has 12 divisors (see below), whose sum is σ = 538952988. Its totient is φ = 102657696.

The previous prime is 256644239. The next prime is 256644313. The reversal of 256644260 is 62446652.

It can be written as a sum of positive squares in 2 ways, for example, as 28815424 + 227828836 = 5368^2 + 15094^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 256644260.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 6416087 + ... + 6416126.

It is an arithmetic number, because the mean of its divisors is an integer number (44912749).

Almost surely, 2^256644260 is an apocalyptic number.

256644260 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

256644260 is an abundant number, since it is smaller than the sum of its proper divisors (282308728).

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

256644260 is a wasteful number, since it uses less digits than its factorization.

256644260 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12832222 (or 12832220 counting only the distinct ones).

The product of its (nonzero) digits is 69120, while the sum is 35.

The square root of 256644260 is about 16020.1204739540. The cubic root of 256644260 is about 635.4926303067.

The spelling of 256644260 in words is "two hundred fifty-six million, six hundred forty-four thousand, two hundred sixty".