664324812 has 18 divisors (see below), whose sum is σ = 1679265588. Its totient is φ = 221441592.

The previous prime is 664324781. The next prime is 664324813. The reversal of 664324812 is 218423466.

664324812 is a `hidden beast` number, since 6 + 643 + 2 + 4 + 8 + 1 + 2 = 666.

664324812 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a tau number, because it is divible by the number of its divisors (18).

It is a Harshad number since it is a multiple of its sum of digits (36), and also a Moran number because the ratio is a prime number: 18453467 = 664324812 / (6 + 6 + 4 + 3 + 2 + 4 + 8 + 1 + 2).

It is not an unprimeable number, because it can be changed into a prime (664324813) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 9226698 + ... + 9226769.

Almost surely, 2^664324812 is an apocalyptic number.

It is an amenable number.

664324812 is an abundant number, since it is smaller than the sum of its proper divisors (1014940776).

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

664324812 is a wasteful number, since it uses less digits than its factorization.

664324812 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 18453477 (or 18453472 counting only the distinct ones).

The product of its digits is 55296, while the sum is 36.

The square root of 664324812 is about 25774.4992579875. The cubic root of 664324812 is about 872.5563654087.

The spelling of 664324812 in words is "six hundred sixty-four million, three hundred twenty-four thousand, eight hundred twelve".