656739072 has 108 divisors (see below), whose sum is σ = 2065760424. Its totient is φ = 199004160.

The previous prime is 656739029. The next prime is 656739091. The reversal of 656739072 is 270937656.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 12388 + ... + 38300.

Almost surely, 2^656739072 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 656739072, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1032880212).

656739072 is an abundant number, since it is smaller than the sum of its proper divisors (1409021352).

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

656739072 is a wasteful number, since it uses less digits than its factorization.

656739072 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 25946 (or 25929 counting only the distinct ones).

The product of its (nonzero) digits is 476280, while the sum is 45.

The square root of 656739072 is about 25626.9208450801. The cubic root of 656739072 is about 869.2224840993. Note that the first 3 decimals are identical.

The spelling of 656739072 in words is "six hundred fifty-six million, seven hundred thirty-nine thousand, seventy-two".