664316020 has 12 divisors (see below), whose sum is σ = 1395063684. Its totient is φ = 265726400.

The previous prime is 664316011. The next prime is 664316041. The reversal of 664316020 is 20613466.

It can be written as a sum of positive squares in 2 ways, for example, as 187854436 + 476461584 = 13706^2 + 21828^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 664316020.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 16607881 + ... + 16607920.

It is an arithmetic number, because the mean of its divisors is an integer number (116255307).

Almost surely, 2^664316020 is an apocalyptic number.

It is an amenable number.

664316020 is an abundant number, since it is smaller than the sum of its proper divisors (730747664).

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

664316020 is a wasteful number, since it uses less digits than its factorization.

664316020 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 33215810 (or 33215808 counting only the distinct ones).

The product of its (nonzero) digits is 5184, while the sum is 28.

The square root of 664316020 is about 25774.3287012485. The cubic root of 664316020 is about 872.5525161122.

Adding to 664316020 its reverse (20613466), we get a palindrome (684929486).

The spelling of 664316020 in words is "six hundred sixty-four million, three hundred sixteen thousand, twenty".