257720374 has 12 divisors (see below), whose sum is σ = 410659164. Its totient is φ = 121279904.

The previous prime is 257720347. The next prime is 257720381. The reversal of 257720374 is 473027752.

It is a congruent number.

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 5 ways as a sum of consecutive naturals, for example, 222364 + ... + 223519.

It is an arithmetic number, because the mean of its divisors is an integer number (34221597).

Almost surely, 2^257720374 is an apocalyptic number.

257720374 is a deficient number, since it is larger than the sum of its proper divisors (152938790).

257720374 is a wasteful number, since it uses less digits than its factorization.

257720374 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 445919 (or 445902 counting only the distinct ones).

The product of its (nonzero) digits is 82320, while the sum is 37.

The square root of 257720374 is about 16053.6716672542. The cubic root of 257720374 is about 636.3796024405.

The spelling of 257720374 in words is "two hundred fifty-seven million, seven hundred twenty thousand, three hundred seventy-four".