664424224 has 24 divisors (see below), whose sum is σ = 1376933040. Its totient is φ = 314726976.

The previous prime is 664424197. The next prime is 664424239. The reversal of 664424224 is 422424466.

It is a self number, because there is not a number n which added to its sum of digits gives 664424224.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 545794 + ... + 547009.

It is an arithmetic number, because the mean of its divisors is an integer number (57372210).

Almost surely, 2^664424224 is an apocalyptic number.

It is an amenable number.

664424224 is an abundant number, since it is smaller than the sum of its proper divisors (712508816).

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

664424224 is a wasteful number, since it uses less digits than its factorization.

664424224 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1092832 (or 1092824 counting only the distinct ones).

The product of its digits is 73728, while the sum is 34.

The square root of 664424224 is about 25776.4276811198. The cubic root of 664424224 is about 872.5998874154.

The spelling of 664424224 in words is "six hundred sixty-four million, four hundred twenty-four thousand, two hundred twenty-four".