256565964 has 24 divisors (see below), whose sum is σ = 599221168. Its totient is φ = 85440960.

The previous prime is 256565963. The next prime is 256565971. The reversal of 256565964 is 469565652.

It is not an unprimeable number, because it can be changed into a prime (256565963) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 3834 + ... + 22974.

Almost surely, 2^256565964 is an apocalyptic number.

It is an amenable number.

256565964 is an abundant number, since it is smaller than the sum of its proper divisors (342655204).

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

256565964 is a wasteful number, since it uses less digits than its factorization.

256565964 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 20265 (or 20263 counting only the distinct ones).

The product of its digits is 1944000, while the sum is 48.

The square root of 256565964 is about 16017.6766105450. The cubic root of 256565964 is about 635.4279992207.

The spelling of 256565964 in words is "two hundred fifty-six million, five hundred sixty-five thousand, nine hundred sixty-four".