257525138 has 16 divisors (see below), whose sum is σ = 416427480. Its totient is φ = 118736256.

The previous prime is 257525123. The next prime is 257525159. The reversal of 257525138 is 831525752.

257525138 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 4 ways, for example, as 230827249 + 26697889 = 15193^2 + 5167^2 .

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, 24008 + ... + 33036.

Almost surely, 2^257525138 is an apocalyptic number.

257525138 is a deficient number, since it is larger than the sum of its proper divisors (158902342).

257525138 is a wasteful number, since it uses less digits than its factorization.

257525138 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10141.

The product of its digits is 84000, while the sum is 38.

The square root of 257525138 is about 16047.5897878778. The cubic root of 257525138 is about 636.2188654460.

The spelling of 257525138 in words is "two hundred fifty-seven million, five hundred twenty-five thousand, one hundred thirty-eight".