663986736 has 120 divisors (see below), whose sum is σ = 2173233920. Its totient is φ = 185286528.

The previous prime is 663986723. The next prime is 663986753. The reversal of 663986736 is 637689366.

It is a happy number.

It is a nude number because it is divisible by every one of its digits.

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 23 ways as a sum of consecutive naturals, for example, 35685 + ... + 51003.

Almost surely, 2^663986736 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 663986736, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1086616960).

663986736 is an abundant number, since it is smaller than the sum of its proper divisors (1509247184).

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

663986736 is a wasteful number, since it uses less digits than its factorization.

663986736 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 15383 (or 15374 counting only the distinct ones).

The product of its digits is 5878656, while the sum is 54.

The square root of 663986736 is about 25767.9400806506. The cubic root of 663986736 is about 872.4083251654.

The spelling of 663986736 in words is "six hundred sixty-three million, nine hundred eighty-six thousand, seven hundred thirty-six".