663604220 has 24 divisors (see below), whose sum is σ = 1394792784. Its totient is φ = 265208576.

The previous prime is 663604189. The next prime is 663604289. The reversal of 663604220 is 22406366.

663604220 is digitally balanced in base 6, because in such base it contains all the possibile digits an equal number of times.

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 7 ways as a sum of consecutive naturals, for example, 9764 + ... + 37716.

It is an arithmetic number, because the mean of its divisors is an integer number (58116366).

Almost surely, 2^663604220 is an apocalyptic number.

It is an amenable number.

663604220 is an abundant number, since it is smaller than the sum of its proper divisors (731188564).

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

663604220 is a wasteful number, since it uses less digits than its factorization.

663604220 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 29149 (or 29147 counting only the distinct ones).

The product of its (nonzero) digits is 10368, while the sum is 29.

The square root of 663604220 is about 25760.5166873648. The cubic root of 663604220 is about 872.2407644659.

The spelling of 663604220 in words is "six hundred sixty-three million, six hundred four thousand, two hundred twenty".