656217960 has 32 divisors (see below), whose sum is σ = 1968654240. Its totient is φ = 174991424.

The previous prime is 656217943. The next prime is 656217967. The reversal of 656217960 is 69712656.

656217960 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a super-2 number, since 2×656217960² = 861244022053123200, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (656217967) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2734122 + ... + 2734361.

It is an arithmetic number, because the mean of its divisors is an integer number (61520445).

Almost surely, 2^656217960 is an apocalyptic number.

656217960 is a gapful number since it is divisible by the number (60) formed by its first and last digit.

It is an amenable number.

656217960 is an abundant number, since it is smaller than the sum of its proper divisors (1312436280).

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

656217960 is a wasteful number, since it uses less digits than its factorization.

656217960 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5468497 (or 5468493 counting only the distinct ones).

The product of its (nonzero) digits is 136080, while the sum is 42.

The square root of 656217960 is about 25616.7515504991. The cubic root of 656217960 is about 868.9925185288.

The spelling of 656217960 in words is "six hundred fifty-six million, two hundred seventeen thousand, nine hundred sixty".