257507638 has 12 divisors (see below), whose sum is σ = 399126420. Its totient is φ = 124599540.

The previous prime is 257507629. The next prime is 257507641. The reversal of 257507638 is 836705752.

257507638 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a junction number, because it is equal to n+sod(n) for n = 257507594 and 257507603.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 65068 + ... + 68911.

It is an arithmetic number, because the mean of its divisors is an integer number (33260535).

Almost surely, 2^257507638 is an apocalyptic number.

257507638 is a deficient number, since it is larger than the sum of its proper divisors (141618782).

257507638 is a wasteful number, since it uses less digits than its factorization.

257507638 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 134043 (or 134012 counting only the distinct ones).

The product of its (nonzero) digits is 352800, while the sum is 43.

The square root of 257507638 is about 16047.0445253947. The cubic root of 257507638 is about 636.2044538013.

The spelling of 257507638 in words is "two hundred fifty-seven million, five hundred seven thousand, six hundred thirty-eight".