257720372 has 24 divisors (see below), whose sum is σ = 555090816. Its totient is φ = 101955168.

The previous prime is 257720347. The next prime is 257720381. The reversal of 257720372 is 273027752.

It is a happy number.

It is a Smith number, since the sum of its digits (35) coincides with the sum of the digits of its prime factors.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 353648 + ... + 354375.

It is an arithmetic number, because the mean of its divisors is an integer number (23128784).

Almost surely, 2^257720372 is an apocalyptic number.

It is an amenable number.

257720372 is an abundant number, since it is smaller than the sum of its proper divisors (297370444).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

257720372 is a wasteful number, since it uses less digits than its factorization.

257720372 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 708047 (or 708045 counting only the distinct ones).

The product of its (nonzero) digits is 41160, while the sum is 35.

The square root of 257720372 is about 16053.6716049631. The cubic root of 257720372 is about 636.3796007943.

The spelling of 257720372 in words is "two hundred fifty-seven million, seven hundred twenty thousand, three hundred seventy-two".