663990204 has 12 divisors (see below), whose sum is σ = 1549310504. Its totient is φ = 221330064.

The previous prime is 663990157. The next prime is 663990247. The reversal of 663990204 is 402099366.

It is a happy number.

It is a tau number, because it is divible by the number of its divisors (12).

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 3 ways as a sum of consecutive naturals, for example, 27666247 + ... + 27666270.

Almost surely, 2^663990204 is an apocalyptic number.

It is an amenable number.

663990204 is an abundant number, since it is smaller than the sum of its proper divisors (885320300).

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

663990204 is a wasteful number, since it uses less digits than its factorization.

663990204 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 55332524 (or 55332522 counting only the distinct ones).

The product of its (nonzero) digits is 69984, while the sum is 39.

The square root of 663990204 is about 25768.0073734854. The cubic root of 663990204 is about 872.4098440245.

The spelling of 663990204 in words is "six hundred sixty-three million, nine hundred ninety thousand, two hundred four".