663788736 has 168 divisors, whose sum is σ = 2114001360. Its totient is φ = 204152832.

The previous prime is 663788711. The next prime is 663788791. The reversal of 663788736 is 637887366.

It is a Harshad number since it is a multiple of its sum of digits (54).

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 290896 + ... + 293168.

Almost surely, 2^663788736 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 663788736, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1057000680).

663788736 is an abundant number, since it is smaller than the sum of its proper divisors (1450212624).

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

663788736 is a wasteful number, since it uses less digits than its factorization.

663788736 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2320 (or 2291 counting only the distinct ones).

The product of its digits is 6096384, while the sum is 54.

The square root of 663788736 is about 25764.0978107133. The cubic root of 663788736 is about 872.3215995268.

The spelling of 663788736 in words is "six hundred sixty-three million, seven hundred eighty-eight thousand, seven hundred thirty-six".