656334320 has 80 divisors (see below), whose sum is σ = 1569006720. Its totient is φ = 255209472.

The previous prime is 656334311. The next prime is 656334331. The reversal of 656334320 is 23433656.

It is a tau number, because it is divible by the number of its divisors (80).

It is a congruent number.

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, 649976 + ... + 650984.

It is an arithmetic number, because the mean of its divisors is an integer number (19612584).

Almost surely, 2^656334320 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 656334320, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (784503360).

656334320 is an abundant number, since it is smaller than the sum of its proper divisors (912672400).

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

656334320 is a wasteful number, since it uses less digits than its factorization.

656334320 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1242 (or 1236 counting only the distinct ones).

The product of its (nonzero) digits is 38880, while the sum is 32.

The square root of 656334320 is about 25619.0226199205. The cubic root of 656334320 is about 869.0438784933.

Adding to 656334320 its reverse (23433656), we get a palindrome (679767976).

The spelling of 656334320 in words is "six hundred fifty-six million, three hundred thirty-four thousand, three hundred twenty".