656089680 has 40 divisors (see below), whose sum is σ = 2033878752. Its totient is φ = 174957184.

The previous prime is 656089669. The next prime is 656089711. The reversal of 656089680 is 86980656.

It is a tau number, because it is divible by the number of its divisors (40).

It is a Harshad number since it is a multiple of its sum of digits (48).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1366614 + ... + 1367093.

Almost surely, 2^656089680 is an apocalyptic number.

656089680 is a gapful number since it is divisible by the number (60) formed by its first and last digit.

It is an amenable number.

656089680 is an abundant number, since it is smaller than the sum of its proper divisors (1377789072).

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

656089680 is a wasteful number, since it uses less digits than its factorization.

656089680 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2733723 (or 2733717 counting only the distinct ones).

The product of its (nonzero) digits is 622080, while the sum is 48.

The square root of 656089680 is about 25614.2475977726. The cubic root of 656089680 is about 868.9358901768.

The spelling of 656089680 in words is "six hundred fifty-six million, eighty-nine thousand, six hundred eighty".