256601264 has 20 divisors (see below), whose sum is σ = 526410504. Its totient is φ = 120753408.

The previous prime is 256601263. The next prime is 256601273. The reversal of 256601264 is 462106652.

It is a self number, because there is not a number n which added to its sum of digits gives 256601264.

It is not an unprimeable number, because it can be changed into a prime (256601263) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 471422 + ... + 471965.

Almost surely, 2^256601264 is an apocalyptic number.

It is an amenable number.

256601264 is an abundant number, since it is smaller than the sum of its proper divisors (269809240).

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

256601264 is a wasteful number, since it uses less digits than its factorization.

256601264 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 943412 (or 943406 counting only the distinct ones).

The product of its (nonzero) digits is 17280, while the sum is 32.

The square root of 256601264 is about 16018.7784802712. The cubic root of 256601264 is about 635.4571399784.

The spelling of 256601264 in words is "two hundred fifty-six million, six hundred one thousand, two hundred sixty-four".