664320320 has 28 divisors (see below), whose sum is σ = 1581913524. Its totient is φ = 265728000.

The previous prime is 664320301. The next prime is 664320323. The reversal of 664320320 is 23023466.

It can be written as a sum of positive squares in 2 ways, for example, as 512931904 + 151388416 = 22648^2 + 12304^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 664320320.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (664320323) by changing a digit.

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, 1037681 + ... + 1038320.

Almost surely, 2^664320320 is an apocalyptic number.

It is an amenable number.

664320320 is an abundant number, since it is smaller than the sum of its proper divisors (917593204).

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

664320320 is a wasteful number, since it uses less digits than its factorization.

664320320 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2076018 (or 2076008 counting only the distinct ones).

The product of its (nonzero) digits is 5184, while the sum is 26.

The square root of 664320320 is about 25774.4121174470. The cubic root of 664320320 is about 872.5543987341.

Adding to 664320320 its reverse (23023466), we get a palindrome (687343786).

The spelling of 664320320 in words is "six hundred sixty-four million, three hundred twenty thousand, three hundred twenty".