656321328 has 120 divisors (see below), whose sum is σ = 1988015120. Its totient is φ = 200931840.

The previous prime is 656321299. The next prime is 656321371. The reversal of 656321328 is 823123656.

It is a happy number.

656321328 is a `hidden beast` number, since 6 + 5 + 6 + 321 + 328 = 666.

656321328 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a junction number, because it is equal to n+sod(n) for n = 656321292 and 656321301.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 427923 + ... + 429453.

Almost surely, 2^656321328 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 656321328, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (994007560).

656321328 is an abundant number, since it is smaller than the sum of its proper divisors (1331693792).

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

656321328 is a wasteful number, since it uses less digits than its factorization.

656321328 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1787 (or 1778 counting only the distinct ones).

The product of its digits is 51840, while the sum is 36.

The square root of 656321328 is about 25618.7690570800. The cubic root of 656321328 is about 869.0381442751.

The spelling of 656321328 in words is "six hundred fifty-six million, three hundred twenty-one thousand, three hundred twenty-eight".