656428224 has 112 divisors (see below), whose sum is σ = 1855134720. Its totient is φ = 204395520.

The previous prime is 656428181. The next prime is 656428237. The reversal of 656428224 is 422824656.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 170707 + ... + 174509.

Almost surely, 2^656428224 is an apocalyptic number.

656428224 is a gapful number since it is divisible by the number (64) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 656428224, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (927567360).

656428224 is an abundant number, since it is smaller than the sum of its proper divisors (1198706496).

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

656428224 is a wasteful number, since it uses less digits than its factorization.

656428224 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3878 (or 3868 counting only the distinct ones).

The product of its digits is 184320, while the sum is 39.

The square root of 656428224 is about 25620.8552550456. The cubic root of 656428224 is about 869.0853222120.

The spelling of 656428224 in words is "six hundred fifty-six million, four hundred twenty-eight thousand, two hundred twenty-four".