257668692 has 12 divisors (see below), whose sum is σ = 601226976. Its totient is φ = 85889560.

The previous prime is 257668681. The next prime is 257668721. The reversal of 257668692 is 296866752.

It is a tau number, because it is divible by the number of its divisors (12).

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 10736184 + ... + 10736207.

It is an arithmetic number, because the mean of its divisors is an integer number (50102248).

Almost surely, 2^257668692 is an apocalyptic number.

It is an amenable number.

257668692 is an abundant number, since it is smaller than the sum of its proper divisors (343558284).

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

257668692 is a wasteful number, since it uses less digits than its factorization.

257668692 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 21472398 (or 21472396 counting only the distinct ones).

The product of its digits is 2177280, while the sum is 51.

The square root of 257668692 is about 16052.0619236284. The cubic root of 257668692 is about 636.3370607653.

The spelling of 257668692 in words is "two hundred fifty-seven million, six hundred sixty-eight thousand, six hundred ninety-two".