257720492 has 12 divisors (see below), whose sum is σ = 454454616. Its totient is φ = 127876320.

The previous prime is 257720483. The next prime is 257720509. The reversal of 257720492 is 294027752.

It is an unprimeable number.

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, 245393 + ... + 246440.

It is an arithmetic number, because the mean of its divisors is an integer number (37871218).

Almost surely, 2^257720492 is an apocalyptic number.

It is an amenable number.

257720492 is a deficient number, since it is larger than the sum of its proper divisors (196734124).

257720492 is a wasteful number, since it uses less digits than its factorization.

257720492 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 491968 (or 491966 counting only the distinct ones).

The product of its (nonzero) digits is 70560, while the sum is 38.

The square root of 257720492 is about 16053.6753424255. The cubic root of 257720492 is about 636.3796995648.

The spelling of 257720492 in words is "two hundred fifty-seven million, seven hundred twenty thousand, four hundred ninety-two".