657608128 has 28 divisors (see below), whose sum is σ = 1311727120. Its totient is φ = 327094272.

The previous prime is 657608123. The next prime is 657608129. The reversal of 657608128 is 821806756.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (657608123) by changing a digit.

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 3 ways as a sum of consecutive naturals, for example, 14268 + ... + 38971.

Almost surely, 2^657608128 is an apocalyptic number.

It is an amenable number.

657608128 is a deficient number, since it is larger than the sum of its proper divisors (654118992).

657608128 is a wasteful number, since it uses less digits than its factorization.

657608128 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 53444 (or 53434 counting only the distinct ones).

The product of its (nonzero) digits is 161280, while the sum is 43.

The square root of 657608128 is about 25643.8711586219. The cubic root of 657608128 is about 869.6057261337.

The spelling of 657608128 in words is "six hundred fifty-seven million, six hundred eight thousand, one hundred twenty-eight".