663209920 has 28 divisors (see below), whose sum is σ = 1579269384. Its totient is φ = 265283840.

The previous prime is 663209909. The next prime is 663209927. The reversal of 663209920 is 29902366.

663209920 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a Smith number, since the sum of its digits (37) coincides with the sum of the digits of its prime factors.

It is a self number, because there is not a number n which added to its sum of digits gives 663209920.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (663209927) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1035946 + ... + 1036585.

It is an arithmetic number, because the mean of its divisors is an integer number (56402478).

Almost surely, 2^663209920 is an apocalyptic number.

It is an amenable number.

663209920 is an abundant number, since it is smaller than the sum of its proper divisors (916059464).

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

663209920 is a wasteful number, since it uses less digits than its factorization.

663209920 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2072548 (or 2072538 counting only the distinct ones).

The product of its (nonzero) digits is 34992, while the sum is 37.

The square root of 663209920 is about 25752.8623651819. The cubic root of 663209920 is about 872.0679743886.

The spelling of 663209920 in words is "six hundred sixty-three million, two hundred nine thousand, nine hundred twenty".