257157804 has 12 divisors (see below), whose sum is σ = 600034904. Its totient is φ = 85719264.

The previous prime is 257157787. The next prime is 257157809. The reversal of 257157804 is 408751752.

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

It is a super-2 number, since 2×257157804² = 132260272316204832, which contains 22 as substring.

It is a hoax number, since the sum of its digits (39) coincides with the sum of the digits of its distinct prime factors.

It is not an unprimeable number, because it can be changed into a prime (257157809) by changing a digit.

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, 10714897 + ... + 10714920.

Almost surely, 2^257157804 is an apocalyptic number.

It is an amenable number.

257157804 is an abundant number, since it is smaller than the sum of its proper divisors (342877100).

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

257157804 is a wasteful number, since it uses less digits than its factorization.

257157804 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 21429824 (or 21429822 counting only the distinct ones).

The product of its (nonzero) digits is 78400, while the sum is 39.

The square root of 257157804 is about 16036.1405581268. The cubic root of 257157804 is about 635.9162205216.

The spelling of 257157804 in words is "two hundred fifty-seven million, one hundred fifty-seven thousand, eight hundred four".