663603720 has 64 divisors (see below), whose sum is σ = 2143955520. Its totient is φ = 163348224.

The previous prime is 663603691. The next prime is 663603749. The reversal of 663603720 is 27306366.

It is an interprime number because it is at equal distance from previous prime (663603691) and next prime (663603749).

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 211134 + ... + 214253.

It is an arithmetic number, because the mean of its divisors is an integer number (33499305).

Almost surely, 2^663603720 is an apocalyptic number.

663603720 is a gapful number since it is divisible by the number (60) formed by its first and last digit.

It is an amenable number.

663603720 is an abundant number, since it is smaller than the sum of its proper divisors (1480351800).

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

663603720 is a wasteful number, since it uses less digits than its factorization.

663603720 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 425414 (or 425410 counting only the distinct ones).

The product of its (nonzero) digits is 27216, while the sum is 33.

The square root of 663603720 is about 25760.5069825887. The cubic root of 663603720 is about 872.2405453994.

The spelling of 663603720 in words is "six hundred sixty-three million, six hundred three thousand, seven hundred twenty".