664620564 has 24 divisors (see below), whose sum is σ = 1560663328. Its totient is φ = 220128480.

The previous prime is 664620511. The next prime is 664620571. The reversal of 664620564 is 465026466.

664620564 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 an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 174502 + ... + 178269.

Almost surely, 2^664620564 is an apocalyptic number.

It is an amenable number.

664620564 is an abundant number, since it is smaller than the sum of its proper divisors (896042764).

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

664620564 is a wasteful number, since it uses less digits than its factorization.

664620564 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 352935 (or 352933 counting only the distinct ones).

The product of its (nonzero) digits is 207360, while the sum is 39.

The square root of 664620564 is about 25780.2359182378. The cubic root of 664620564 is about 872.6858311958.

The spelling of 664620564 in words is "six hundred sixty-four million, six hundred twenty thousand, five hundred sixty-four".