257720404 has 12 divisors (see below), whose sum is σ = 451429524. Its totient is φ = 128740544.

The previous prime is 257720401. The next prime is 257720417. The reversal of 257720404 is 404027752.

It can be written as a sum of positive squares in 2 ways, for example, as 185504400 + 72216004 = 13620^2 + 8498^2 .

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (257720401) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 24979 + ... + 33754.

It is an arithmetic number, because the mean of its divisors is an integer number (37619127).

Almost surely, 2^257720404 is an apocalyptic number.

It is an amenable number.

257720404 is a deficient number, since it is larger than the sum of its proper divisors (193709120).

257720404 is a wasteful number, since it uses less digits than its factorization.

257720404 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 59834 (or 59832 counting only the distinct ones).

The product of its (nonzero) digits is 15680, while the sum is 31.

The square root of 257720404 is about 16053.6726016199. The cubic root of 257720404 is about 636.3796271331.

The spelling of 257720404 in words is "two hundred fifty-seven million, seven hundred twenty thousand, four hundred four".