663917280 has 96 divisors (see below), whose sum is σ = 2252232864. Its totient is φ = 163424256.

The previous prime is 663917251. The next prime is 663917281. The reversal of 663917280 is 82719366.

It is a happy number.

It is a tau number, because it is divible by the number of its divisors (96).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (663917281) by changing a digit.

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, 46959 + ... + 59438.

It is an arithmetic number, because the mean of its divisors is an integer number (23460759).

Almost surely, 2^663917280 is an apocalyptic number.

663917280 is a gapful number since it is divisible by the number (60) formed by its first and last digit.

It is an amenable number.

663917280 is an abundant number, since it is smaller than the sum of its proper divisors (1588315584).

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

663917280 is a wasteful number, since it uses less digits than its factorization.

663917280 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 106428 (or 106420 counting only the distinct ones).

The product of its (nonzero) digits is 108864, while the sum is 42.

The square root of 663917280 is about 25766.5923241705. The cubic root of 663917280 is about 872.3779048260.

The spelling of 663917280 in words is "six hundred sixty-three million, nine hundred seventeen thousand, two hundred eighty".