663939584 has 120 divisors (see below), whose sum is σ = 1667539104. Its totient is φ = 258508800.

The previous prime is 663939569. The next prime is 663939589. The reversal of 663939584 is 485939366.

It is not an unprimeable number, because it can be changed into a prime (663939589) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 432899 + ... + 434429.

Almost surely, 2^663939584 is an apocalyptic number.

663939584 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 663939584, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (833769552).

663939584 is an abundant number, since it is smaller than the sum of its proper divisors (1003599520).

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

663939584 is a wasteful number, since it uses less digits than its factorization.

663939584 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1578 (or 1551 counting only the distinct ones).

The product of its digits is 4199040, while the sum is 53.

The square root of 663939584 is about 25767.0251290288. The cubic root of 663939584 is about 872.3876737634.

The spelling of 663939584 in words is "six hundred sixty-three million, nine hundred thirty-nine thousand, five hundred eighty-four".