257478633 has 12 divisors (see below), whose sum is σ = 391488240. Its totient is φ = 162617976.

The previous prime is 257478631. The next prime is 257478659. The reversal of 257478633 is 336874752.

257478633 is a `hidden beast` number, since 2 + 5 + 7 + 4 + 7 + 8 + 633 = 666.

It is not a de Polignac number, because 257478633 - 2¹ = 257478631 is a prime.

It is not an unprimeable number, because it can be changed into a prime (257478631) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 752691 + ... + 753032.

It is an arithmetic number, because the mean of its divisors is an integer number (32624020).

Almost surely, 2^257478633 is an apocalyptic number.

It is an amenable number.

257478633 is a deficient number, since it is larger than the sum of its proper divisors (134009607).

257478633 is a wasteful number, since it uses less digits than its factorization.

257478633 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1505748 (or 1505745 counting only the distinct ones).

The product of its digits is 846720, while the sum is 45.

The square root of 257478633 is about 16046.1407509719. The cubic root of 257478633 is about 636.1805660917.

The spelling of 257478633 in words is "two hundred fifty-seven million, four hundred seventy-eight thousand, six hundred thirty-three".