656718972 has 144 divisors (see below), whose sum is σ = 1957066272. Its totient is φ = 169827840.

The previous prime is 656718967. The next prime is 656718989. The reversal of 656718972 is 279817656.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 404322 + ... + 405942.

It is an arithmetic number, because the mean of its divisors is an integer number (13590738).

Almost surely, 2^656718972 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 656718972, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (978533136).

656718972 is an abundant number, since it is smaller than the sum of its proper divisors (1300347300).

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

656718972 is a wasteful number, since it uses less digits than its factorization.

656718972 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1708 (or 1699 counting only the distinct ones).

The product of its digits is 1270080, while the sum is 51.

The square root of 656718972 is about 25626.5286763541. The cubic root of 656718972 is about 869.2136162698.

The spelling of 656718972 in words is "six hundred fifty-six million, seven hundred eighteen thousand, nine hundred seventy-two".