656431696 has 40 divisors (see below), whose sum is σ = 1332525824. Its totient is φ = 312871680.

The previous prime is 656431673. The next prime is 656431697. The reversal of 656431696 is 696134656.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (656431697) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 23356 + ... + 43108.

Almost surely, 2^656431696 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 656431696, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (666262912).

656431696 is an abundant number, since it is smaller than the sum of its proper divisors (676094128).

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

656431696 is a wasteful number, since it uses less digits than its factorization.

656431696 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 19859 (or 19853 counting only the distinct ones).

The product of its digits is 699840, while the sum is 46.

The square root of 656431696 is about 25620.9230122570. The cubic root of 656431696 is about 869.0868544734.

The spelling of 656431696 in words is "six hundred fifty-six million, four hundred thirty-one thousand, six hundred ninety-six".