664264404 has 72 divisors (see below), whose sum is σ = 1780233728. Its totient is φ = 208474560.

The previous prime is 664264397. The next prime is 664264417. The reversal of 664264404 is 404462466.

It is a happy number.

664264404 is a `hidden beast` number, since 6 + 6 + 4 + 2 + 644 + 0 + 4 = 666.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 33249 + ... + 49335.

Almost surely, 2^664264404 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 664264404, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (890116864).

664264404 is an abundant number, since it is smaller than the sum of its proper divisors (1115969324).

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

664264404 is a wasteful number, since it uses less digits than its factorization.

664264404 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 16165 (or 16160 counting only the distinct ones).

The product of its (nonzero) digits is 110592, while the sum is 36.

The square root of 664264404 is about 25773.3273754089. The cubic root of 664264404 is about 872.5299170099.

The spelling of 664264404 in words is "six hundred sixty-four million, two hundred sixty-four thousand, four hundred four".