257678680 has 32 divisors (see below), whose sum is σ = 662603040. Its totient is φ = 88346880.

The previous prime is 257678677. The next prime is 257678731. The reversal of 257678680 is 86876752.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 459861 + ... + 460420.

It is an arithmetic number, because the mean of its divisors is an integer number (20706345).

Almost surely, 2^257678680 is an apocalyptic number.

257678680 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

257678680 is an abundant number, since it is smaller than the sum of its proper divisors (404924360).

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

257678680 is a wasteful number, since it uses less digits than its factorization.

257678680 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 920299 (or 920295 counting only the distinct ones).

The product of its (nonzero) digits is 1128960, while the sum is 49.

The square root of 257678680 is about 16052.3730332932. The cubic root of 257678680 is about 636.3452827607.

The spelling of 257678680 in words is "two hundred fifty-seven million, six hundred seventy-eight thousand, six hundred eighty".