257690392 has 16 divisors (see below), whose sum is σ = 483555600. Its totient is φ = 128742240.

The previous prime is 257690359. The next prime is 257690393. The reversal of 257690392 is 293096752.

It is a super-2 number, since 2×257690392² = 132808676258227328, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (257690393) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1659 + ... + 22762.

It is an arithmetic number, because the mean of its divisors is an integer number (30222225).

Almost surely, 2^257690392 is an apocalyptic number.

It is an amenable number.

257690392 is a deficient number, since it is larger than the sum of its proper divisors (225865208).

257690392 is a wasteful number, since it uses less digits than its factorization.

257690392 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 25746 (or 25742 counting only the distinct ones).

The product of its (nonzero) digits is 204120, while the sum is 43.

The square root of 257690392 is about 16052.7378350237. The cubic root of 257690392 is about 636.3549236606.

The spelling of 257690392 in words is "two hundred fifty-seven million, six hundred ninety thousand, three hundred ninety-two".