656578912 has 72 divisors (see below), whose sum is σ = 1459554768. Its totient is φ = 290315520.

The previous prime is 656578891. The next prime is 656578919. The reversal of 656578912 is 219875656.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (656578919) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 140973 + ... + 145555.

It is an arithmetic number, because the mean of its divisors is an integer number (20271594).

Almost surely, 2^656578912 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 656578912, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (729777384).

656578912 is an abundant number, since it is smaller than the sum of its proper divisors (802975856).

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

656578912 is a wasteful number, since it uses less digits than its factorization.

656578912 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4652 (or 4633 counting only the distinct ones).

The product of its digits is 907200, while the sum is 49.

The square root of 656578912 is about 25623.7958156086. The cubic root of 656578912 is about 869.1518187989.

The spelling of 656578912 in words is "six hundred fifty-six million, five hundred seventy-eight thousand, nine hundred twelve".