257792140 has 12 divisors (see below), whose sum is σ = 541363536. Its totient is φ = 103116848.

The previous prime is 257792123. The next prime is 257792141. The reversal of 257792140 is 41297752.

It is a self number, because there is not a number n which added to its sum of digits gives 257792140.

It is not an unprimeable number, because it can be changed into a prime (257792141) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 6444784 + ... + 6444823.

It is an arithmetic number, because the mean of its divisors is an integer number (45113628).

Almost surely, 2^257792140 is an apocalyptic number.

257792140 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

257792140 is an abundant number, since it is smaller than the sum of its proper divisors (283571396).

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

257792140 is a wasteful number, since it uses less digits than its factorization.

257792140 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12889616 (or 12889614 counting only the distinct ones).

The product of its (nonzero) digits is 35280, while the sum is 37.

The square root of 257792140 is about 16055.9067012735. The cubic root of 257792140 is about 636.4386666882.

The spelling of 257792140 in words is "two hundred fifty-seven million, seven hundred ninety-two thousand, one hundred forty".