657138628 has 12 divisors (see below), whose sum is σ = 1150279312. Its totient is φ = 328487400.

The previous prime is 657138593. The next prime is 657138641. The reversal of 657138628 is 826831756.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 198 + ... + 36253.

Almost surely, 2^657138628 is an apocalyptic number.

It is an amenable number.

657138628 is a deficient number, since it is larger than the sum of its proper divisors (493140684).

657138628 is a wasteful number, since it uses less digits than its factorization.

657138628 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 40962 (or 40960 counting only the distinct ones).

The product of its digits is 483840, while the sum is 46.

The square root of 657138628 is about 25634.7152900125. The cubic root of 657138628 is about 869.3987248952.

The spelling of 657138628 in words is "six hundred fifty-seven million, one hundred thirty-eight thousand, six hundred twenty-eight".