664928013 has 16 divisors (see below), whose sum is σ = 896255360. Its totient is φ = 438457536.

The previous prime is 664928003. The next prime is 664928041. The reversal of 664928013 is 310829466.

It is not a de Polignac number, because 664928013 - 2⁴ = 664927997 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (664928003) 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, 236331 + ... + 239127.

It is an arithmetic number, because the mean of its divisors is an integer number (56015960).

Almost surely, 2^664928013 is an apocalyptic number.

It is an amenable number.

664928013 is a deficient number, since it is larger than the sum of its proper divisors (231327347).

664928013 is a wasteful number, since it uses less digits than its factorization.

664928013 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3636.

The product of its (nonzero) digits is 62208, while the sum is 39.

The square root of 664928013 is about 25786.1981106172. The cubic root of 664928013 is about 872.8203766488.

The spelling of 664928013 in words is "six hundred sixty-four million, nine hundred twenty-eight thousand, thirteen".