257693868 has 18 divisors (see below), whose sum is σ = 651392924. Its totient is φ = 85897944.

The previous prime is 257693833. The next prime is 257693879. The reversal of 257693868 is 868396752.

It is a happy number.

257693868 is a `hidden beast` number, since 2 + 576 + 9 + 3 + 8 + 68 = 666.

257693868 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a tau number, because it is divible by the number of its divisors (18).

It is a super-2 number, since 2×257693868² = 132812259209602848, which contains 22 as substring.

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, 3579046 + ... + 3579117.

Almost surely, 2^257693868 is an apocalyptic number.

It is an amenable number.

257693868 is an abundant number, since it is smaller than the sum of its proper divisors (393699056).

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

257693868 is a wasteful number, since it uses less digits than its factorization.

257693868 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7158173 (or 7158168 counting only the distinct ones).

The product of its digits is 4354560, while the sum is 54.

The square root of 257693868 is about 16052.8461027944. The cubic root of 257693868 is about 636.3577849233.

The spelling of 257693868 in words is "two hundred fifty-seven million, six hundred ninety-three thousand, eight hundred sixty-eight".