664204400 has 60 divisors (see below), whose sum is σ = 1650805800. Its totient is φ = 256515840.

The previous prime is 664204397. The next prime is 664204441. The reversal of 664204400 is 4402466.

It is a self number, because there is not a number n which added to its sum of digits gives 664204400.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 17030 + ... + 40229.

It is an arithmetic number, because the mean of its divisors is an integer number (27513430).

Almost surely, 2^664204400 is an apocalyptic number.

It is an amenable number.

664204400 is an abundant number, since it is smaller than the sum of its proper divisors (986601400).

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

664204400 is a wasteful number, since it uses less digits than its factorization.

664204400 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 57306 (or 57295 counting only the distinct ones).

The product of its (nonzero) digits is 4608, while the sum is 26.

The square root of 664204400 is about 25772.1632774589. The cubic root of 664204400 is about 872.5036439067.

Adding to 664204400 its reverse (4402466), we get a palindrome (668606866).

The spelling of 664204400 in words is "six hundred sixty-four million, two hundred four thousand, four hundred".