63988664 has 16 divisors (see below), whose sum is σ = 120139200. Its totient is φ = 31951552.

The previous prime is 63988621. The next prime is 63988709. The reversal of 63988664 is 46688936.

63988664 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a congruent number.

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 3 ways as a sum of consecutive naturals, for example, 1529 + ... + 11415.

It is an arithmetic number, because the mean of its divisors is an integer number (7508700).

Almost surely, 2^63988664 is an apocalyptic number.

It is an amenable number.

63988664 is a deficient number, since it is larger than the sum of its proper divisors (56150536).

63988664 is a wasteful number, since it uses less digits than its factorization.

63988664 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10702 (or 10698 counting only the distinct ones).

The product of its digits is 1492992, while the sum is 50.

The square root of 63988664 is about 7999.2914686240. The cubic root of 63988664 is about 399.9763819388.

The spelling of 63988664 in words is "sixty-three million, nine hundred eighty-eight thousand, six hundred sixty-four".