257705990 has 32 divisors (see below), whose sum is σ = 469699776. Its totient is φ = 101796480.

The previous prime is 257705989. The next prime is 257706017. The reversal of 257705990 is 99507752.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 312719 + ... + 313541.

It is an arithmetic number, because the mean of its divisors is an integer number (14678118).

Almost surely, 2^257705990 is an apocalyptic number.

257705990 is a deficient number, since it is larger than the sum of its proper divisors (211993786).

257705990 is a wasteful number, since it uses less digits than its factorization.

257705990 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1184.

The product of its (nonzero) digits is 198450, while the sum is 44.

The square root of 257705990 is about 16053.2236638004. The cubic root of 257705990 is about 636.3677629231.

The spelling of 257705990 in words is "two hundred fifty-seven million, seven hundred five thousand, nine hundred ninety".