257470220 has 24 divisors (see below), whose sum is σ = 617928864. Its totient is φ = 88275456.

The previous prime is 257470217. The next prime is 257470231. The reversal of 257470220 is 22074752.

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, 919397 + ... + 919676.

It is an arithmetic number, because the mean of its divisors is an integer number (25747036).

Almost surely, 2^257470220 is an apocalyptic number.

257470220 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

257470220 is an abundant number, since it is smaller than the sum of its proper divisors (360458644).

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

257470220 is a wasteful number, since it uses less digits than its factorization.

257470220 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1839089 (or 1839087 counting only the distinct ones).

The product of its (nonzero) digits is 7840, while the sum is 29.

The square root of 257470220 is about 16045.8785985685. The cubic root of 257470220 is about 636.1736370437.

The spelling of 257470220 in words is "two hundred fifty-seven million, four hundred seventy thousand, two hundred twenty".