656311620 has 48 divisors (see below), whose sum is σ = 1841031360. Its totient is φ = 174696576.

The previous prime is 656311613. The next prime is 656311679. The reversal of 656311620 is 26113656.

It is a Harshad number since it is a multiple of its sum of digits (30).

It is an unprimeable number.

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 15 ways as a sum of consecutive naturals, for example, 24066 + ... + 43494.

It is an arithmetic number, because the mean of its divisors is an integer number (38354820).

Almost surely, 2^656311620 is an apocalyptic number.

656311620 is a gapful number since it is divisible by the number (60) formed by its first and last digit.

It is an amenable number.

656311620 is an abundant number, since it is smaller than the sum of its proper divisors (1184719740).

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

656311620 is a wasteful number, since it uses less digits than its factorization.

656311620 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 20004 (or 20002 counting only the distinct ones).

The product of its (nonzero) digits is 6480, while the sum is 30.

The square root of 656311620 is about 25618.5795859177. The cubic root of 656311620 is about 869.0338594512.

The spelling of 656311620 in words is "six hundred fifty-six million, three hundred eleven thousand, six hundred twenty".