657996920 has 64 divisors (see below), whose sum is σ = 1694200320. Its totient is φ = 225304704.

The previous prime is 657996919. The next prime is 657996953. The reversal of 657996920 is 29699756.

657996920 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a congruent number.

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, 425669 + ... + 427211.

It is an arithmetic number, because the mean of its divisors is an integer number (26471880).

Almost surely, 2^657996920 is an apocalyptic number.

It is an amenable number.

657996920 is an abundant number, since it is smaller than the sum of its proper divisors (1036203400).

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

657996920 is a wasteful number, since it uses less digits than its factorization.

657996920 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3084 (or 3080 counting only the distinct ones).

The product of its (nonzero) digits is 1837080, while the sum is 53.

The square root of 657996920 is about 25651.4506412405. The cubic root of 657996920 is about 869.7770688768. Note that the first 3 decimals are identical.

The spelling of 657996920 in words is "six hundred fifty-seven million, nine hundred ninety-six thousand, nine hundred twenty".