663708672 has 132 divisors (see below), whose sum is σ = 2090985936. Its totient is φ = 201093120.

The previous prime is 663708637. The next prime is 663708691. The reversal of 663708672 is 276807366.

663708672 is a `hidden beast` number, since 6 + 637 + 0 + 8 + 6 + 7 + 2 = 666.

It is a tau number, because it is divible by the number of its divisors (132).

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 98103 + ... + 104649.

Almost surely, 2^663708672 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 663708672, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1045492968).

663708672 is an abundant number, since it is smaller than the sum of its proper divisors (1427277264).

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

663708672 is a wasteful number, since it uses less digits than its factorization.

663708672 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6584 (or 6563 counting only the distinct ones).

The product of its (nonzero) digits is 508032, while the sum is 45.

The square root of 663708672 is about 25762.5439737616. The cubic root of 663708672 is about 872.2865259353.

The spelling of 663708672 in words is "six hundred sixty-three million, seven hundred eight thousand, six hundred seventy-two".