257647460 has 48 divisors (see below), whose sum is σ = 619860864. Its totient is φ = 88121088.

The previous prime is 257647457. The next prime is 257647483. The reversal of 257647460 is 64746752.

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, 61967 + ... + 65993.

It is an arithmetic number, because the mean of its divisors is an integer number (12913768).

Almost surely, 2^257647460 is an apocalyptic number.

257647460 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

257647460 is an abundant number, since it is smaller than the sum of its proper divisors (362213404).

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

257647460 is a wasteful number, since it uses less digits than its factorization.

257647460 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4500 (or 4498 counting only the distinct ones).

The product of its (nonzero) digits is 282240, while the sum is 41.

The square root of 257647460 is about 16051.4005619447. The cubic root of 257647460 is about 636.3195821451.

The spelling of 257647460 in words is "two hundred fifty-seven million, six hundred forty-seven thousand, four hundred sixty".