657640752 has 20 divisors (see below), whose sum is σ = 1698905400. Its totient is φ = 219213568.

The previous prime is 657640741. The next prime is 657640757. The reversal of 657640752 is 257046756.

It is a super-2 number, since 2×657640752² = 864982717382251008, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (657640757) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 6850377 + ... + 6850472.

It is an arithmetic number, because the mean of its divisors is an integer number (84945270).

Almost surely, 2^657640752 is an apocalyptic number.

It is an amenable number.

657640752 is an abundant number, since it is smaller than the sum of its proper divisors (1041264648).

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

657640752 is a wasteful number, since it uses less digits than its factorization.

657640752 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13700860 (or 13700854 counting only the distinct ones).

The product of its (nonzero) digits is 352800, while the sum is 42.

The square root of 657640752 is about 25644.5072481419. The cubic root of 657640752 is about 869.6201063028.

The spelling of 657640752 in words is "six hundred fifty-seven million, six hundred forty thousand, seven hundred fifty-two".