257911864 has 16 divisors (see below), whose sum is σ = 552668400. Its totient is φ = 110533632.

The previous prime is 257911813. The next prime is 257911891. The reversal of 257911864 is 468119752.

It is a self number, because there is not a number n which added to its sum of digits gives 257911864.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2302729 + ... + 2302840.

It is an arithmetic number, because the mean of its divisors is an integer number (34541775).

Almost surely, 2^257911864 is an apocalyptic number.

It is an amenable number.

257911864 is an abundant number, since it is smaller than the sum of its proper divisors (294756536).

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

257911864 is a wasteful number, since it uses less digits than its factorization.

257911864 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4605582 (or 4605578 counting only the distinct ones).

The product of its digits is 120960, while the sum is 43.

The square root of 257911864 is about 16059.6346160179. The cubic root of 257911864 is about 636.5371765317.

The spelling of 257911864 in words is "two hundred fifty-seven million, nine hundred eleven thousand, eight hundred sixty-four".