664872704 has 36 divisors (see below), whose sum is σ = 1352216376. Its totient is φ = 326157312.

The previous prime is 664872697. The next prime is 664872713. The reversal of 664872704 is 407278466.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 10934 + ... + 38069.

It is an arithmetic number, because the mean of its divisors is an integer number (37561566).

Almost surely, 2^664872704 is an apocalyptic number.

664872704 is a gapful number since it is divisible by the number (64) formed by its first and last digit.

It is an amenable number.

664872704 is an abundant number, since it is smaller than the sum of its proper divisors (687343672).

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

664872704 is an equidigital number, since it uses as much as digits as its factorization.

664872704 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 49072 (or 49058 counting only the distinct ones).

The product of its (nonzero) digits is 451584, while the sum is 44.

The square root of 664872704 is about 25785.1256347531. The cubic root of 664872704 is about 872.7961754522.

The spelling of 664872704 in words is "six hundred sixty-four million, eight hundred seventy-two thousand, seven hundred four".