657344644 has 48 divisors (see below), whose sum is σ = 1334672640. Its totient is φ = 279964160.

The previous prime is 657344629. The next prime is 657344657. The reversal of 657344644 is 446443756.

It is a happy number.

It is a self number, because there is not a number n which added to its sum of digits gives 657344644.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 176934 + ... + 180610.

It is an arithmetic number, because the mean of its divisors is an integer number (27805680).

Almost surely, 2^657344644 is an apocalyptic number.

It is an amenable number.

657344644 is an abundant number, since it is smaller than the sum of its proper divisors (677327996).

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

657344644 is a wasteful number, since it uses less digits than its factorization.

657344644 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3948 (or 3946 counting only the distinct ones).

The product of its digits is 967680, while the sum is 43.

The square root of 657344644 is about 25638.7332760415. The cubic root of 657344644 is about 869.4895689100.

The spelling of 657344644 in words is "six hundred fifty-seven million, three hundred forty-four thousand, six hundred forty-four".