664398885 has 32 divisors (see below), whose sum is σ = 1083180672. Its totient is φ = 347662080.

The previous prime is 664398883. The next prime is 664398893. The reversal of 664398885 is 588893466.

It is not a de Polignac number, because 664398885 - 2¹ = 664398883 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (664398883) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 536487 + ... + 537723.

It is an arithmetic number, because the mean of its divisors is an integer number (33849396).

Almost surely, 2^664398885 is an apocalyptic number.

It is an amenable number.

664398885 is a deficient number, since it is larger than the sum of its proper divisors (418781787).

664398885 is a wasteful number, since it uses less digits than its factorization.

664398885 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1893.

The product of its digits is 9953280, while the sum is 57.

The square root of 664398885 is about 25775.9361614666. The cubic root of 664398885 is about 872.5887945580.

The spelling of 664398885 in words is "six hundred sixty-four million, three hundred ninety-eight thousand, eight hundred eighty-five".