256738764 has 12 divisors (see below), whose sum is σ = 599057144. Its totient is φ = 85579584.

The previous prime is 256738763. The next prime is 256738787. The reversal of 256738764 is 467837652.

It is a tau number, because it is divible by the number of its divisors (12).

It is a hoax number, since the sum of its digits (48) coincides with the sum of the digits of its distinct prime factors.

It is not an unprimeable number, because it can be changed into a prime (256738763) 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, 10697437 + ... + 10697460.

Almost surely, 2^256738764 is an apocalyptic number.

It is an amenable number.

256738764 is an abundant number, since it is smaller than the sum of its proper divisors (342318380).

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

256738764 is a wasteful number, since it uses less digits than its factorization.

256738764 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 21394904 (or 21394902 counting only the distinct ones).

The product of its digits is 1693440, while the sum is 48.

The square root of 256738764 is about 16023.0697433419. The cubic root of 256738764 is about 635.5706231225.

The spelling of 256738764 in words is "two hundred fifty-six million, seven hundred thirty-eight thousand, seven hundred sixty-four".