663720732 has 72 divisors (see below), whose sum is σ = 1779890112. Its totient is φ = 207820800.

The previous prime is 663720727. The next prime is 663720737. The reversal of 663720732 is 237027366.

It is an interprime number because it is at equal distance from previous prime (663720727) and next prime (663720737).

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

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (663720737) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 538557 + ... + 539787.

It is an arithmetic number, because the mean of its divisors is an integer number (24720696).

Almost surely, 2^663720732 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 663720732, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (889945056).

663720732 is an abundant number, since it is smaller than the sum of its proper divisors (1116169380).

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

663720732 is a wasteful number, since it uses less digits than its factorization.

663720732 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2139 (or 2134 counting only the distinct ones).

The product of its (nonzero) digits is 63504, while the sum is 36.

The square root of 663720732 is about 25762.7780334342. The cubic root of 663720732 is about 872.2918092332.

The spelling of 663720732 in words is "six hundred sixty-three million, seven hundred twenty thousand, seven hundred thirty-two".