257906864 has 20 divisors (see below), whose sum is σ = 529088904. Its totient is φ = 121367808.

The previous prime is 257906863. The next prime is 257906867. The reversal of 257906864 is 468609752.

It is a hoax number, since the sum of its digits (47) 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 (257906863) 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, 473822 + ... + 474365.

Almost surely, 2^257906864 is an apocalyptic number.

It is an amenable number.

257906864 is an abundant number, since it is smaller than the sum of its proper divisors (271182040).

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

257906864 is a wasteful number, since it uses less digits than its factorization.

257906864 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 948212 (or 948206 counting only the distinct ones).

The product of its (nonzero) digits is 725760, while the sum is 47.

The square root of 257906864 is about 16059.4789454702. The cubic root of 257906864 is about 636.5330631027.

The spelling of 257906864 in words is "two hundred fifty-seven million, nine hundred six thousand, eight hundred sixty-four".