664985724 has 48 divisors (see below), whose sum is σ = 1711762080. Its totient is φ = 199618560.

The previous prime is 664985723. The next prime is 664985749. The reversal of 664985724 is 427589466.

664985724 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (664985723) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 45589 + ... + 58380.

It is an arithmetic number, because the mean of its divisors is an integer number (35661710).

Almost surely, 2^664985724 is an apocalyptic number.

It is an amenable number.

664985724 is an abundant number, since it is smaller than the sum of its proper divisors (1046776356).

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

664985724 is a wasteful number, since it uses less digits than its factorization.

664985724 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 104030 (or 104028 counting only the distinct ones).

The product of its digits is 2903040, while the sum is 51.

The square root of 664985724 is about 25787.3171152022. The cubic root of 664985724 is about 872.8456274422.

The spelling of 664985724 in words is "six hundred sixty-four million, nine hundred eighty-five thousand, seven hundred twenty-four".