663904224 has 72 divisors (see below), whose sum is σ = 1890946512. Its totient is φ = 220953600.

The previous prime is 663904193. The next prime is 663904249. The reversal of 663904224 is 422409366.

It is a tau number, because it is divible by the number of its divisors (72).

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 235624 + ... + 238424.

It is an arithmetic number, because the mean of its divisors is an integer number (26263146).

Almost surely, 2^663904224 is an apocalyptic number.

It is an amenable number.

663904224 is an abundant number, since it is smaller than the sum of its proper divisors (1227042288).

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

663904224 is a wasteful number, since it uses less digits than its factorization.

663904224 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3640 (or 3629 counting only the distinct ones).

The product of its (nonzero) digits is 62208, while the sum is 36.

The square root of 663904224 is about 25766.3389716118. The cubic root of 663904224 is about 872.3721863222.

It can be divided in two parts, 663904 and 224, that added together give a triangular number (664128 = T₁₁₅₂).

The spelling of 663904224 in words is "six hundred sixty-three million, nine hundred four thousand, two hundred twenty-four".