257397960 has 64 divisors (see below), whose sum is σ = 797114880. Its totient is φ = 66424320.

The previous prime is 257397953. The next prime is 257397971. The reversal of 257397960 is 69793752.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 30877 + ... + 38316.

It is an arithmetic number, because the mean of its divisors is an integer number (12454920).

Almost surely, 2^257397960 is an apocalyptic number.

257397960 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

257397960 is an abundant number, since it is smaller than the sum of its proper divisors (539716920).

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

257397960 is a wasteful number, since it uses less digits than its factorization.

257397960 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 69238 (or 69234 counting only the distinct ones).

The product of its (nonzero) digits is 714420, while the sum is 48.

The square root of 257397960 is about 16043.6267720238. The cubic root of 257397960 is about 636.1141166220.

The spelling of 257397960 in words is "two hundred fifty-seven million, three hundred ninety-seven thousand, nine hundred sixty".