656064820 has 12 divisors (see below), whose sum is σ = 1377736164. Its totient is φ = 262425920.

The previous prime is 656064817. The next prime is 656064859. The reversal of 656064820 is 28460656.

It can be written as a sum of positive squares in 2 ways, for example, as 284192164 + 371872656 = 16858^2 + 19284^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 656064820.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 16401601 + ... + 16401640.

It is an arithmetic number, because the mean of its divisors is an integer number (114811347).

Almost surely, 2^656064820 is an apocalyptic number.

It is an amenable number.

656064820 is an abundant number, since it is smaller than the sum of its proper divisors (721671344).

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

656064820 is a wasteful number, since it uses less digits than its factorization.

656064820 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 32803250 (or 32803248 counting only the distinct ones).

The product of its (nonzero) digits is 69120, while the sum is 37.

The square root of 656064820 is about 25613.7623163798. The cubic root of 656064820 is about 868.9249150414.

The spelling of 656064820 in words is "six hundred fifty-six million, sixty-four thousand, eight hundred twenty".