257720992 has 12 divisors (see below), whose sum is σ = 507388266. Its totient is φ = 128860480.

The previous prime is 257720987. The next prime is 257721001. The reversal of 257720992 is 299027752.

It can be written as a sum of positive squares in only one way, i.e., 248503696 + 9217296 = 15764^2 + 3036^2 .

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 4026859 + ... + 4026922.

Almost surely, 2^257720992 is an apocalyptic number.

It is an amenable number.

257720992 is a deficient number, since it is larger than the sum of its proper divisors (249667274).

257720992 is an equidigital number, since it uses as much as digits as its factorization.

257720992 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8053791 (or 8053783 counting only the distinct ones).

The product of its (nonzero) digits is 158760, while the sum is 43.

The square root of 257720992 is about 16053.6909151759. The cubic root of 257720992 is about 636.3801111084.

The spelling of 257720992 in words is "two hundred fifty-seven million, seven hundred twenty thousand, nine hundred ninety-two".