257457140 has 24 divisors (see below), whose sum is σ = 540963360. Its totient is φ = 102925088.

The previous prime is 257457131. The next prime is 257457173. The reversal of 257457140 is 41754752.

It is a self number, because there is not a number n which added to its sum of digits gives 257457140.

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, 62051 + ... + 66069.

It is an arithmetic number, because the mean of its divisors is an integer number (22540140).

Almost surely, 2^257457140 is an apocalyptic number.

257457140 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

257457140 is an abundant number, since it is smaller than the sum of its proper divisors (283506220).

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

257457140 is a wasteful number, since it uses less digits than its factorization.

257457140 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7231 (or 7229 counting only the distinct ones).

The product of its (nonzero) digits is 39200, while the sum is 35.

The square root of 257457140 is about 16045.4710120956. The cubic root of 257457140 is about 636.1628638987.

The spelling of 257457140 in words is "two hundred fifty-seven million, four hundred fifty-seven thousand, one hundred forty".