663988544 has 56 divisors (see below), whose sum is σ = 1342034400. Its totient is φ = 325900800.

The previous prime is 663988529. The next prime is 663988547. The reversal of 663988544 is 445889366.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (663988547) 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 7 ways as a sum of consecutive naturals, for example, 898127 + ... + 898865.

It is an arithmetic number, because the mean of its divisors is an integer number (23964900).

Almost surely, 2^663988544 is an apocalyptic number.

663988544 is a gapful number since it is divisible by the number (64) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 663988544, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (671017200).

663988544 is an abundant number, since it is smaller than the sum of its proper divisors (678045856).

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

663988544 is a wasteful number, since it uses less digits than its factorization.

663988544 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 991 (or 981 counting only the distinct ones).

The product of its digits is 4976640, while the sum is 53.

The square root of 663988544 is about 25767.9751629809. The cubic root of 663988544 is about 872.4091170049.

The spelling of 663988544 in words is "six hundred sixty-three million, nine hundred eighty-eight thousand, five hundred forty-four".