63990864 has 120 divisors (see below), whose sum is σ = 213736320. Its totient is φ = 18277056.

The previous prime is 63990833. The next prime is 63990929. The reversal of 63990864 is 46809936.

63990864 is a `hidden beast` number, since 639 + 9 + 0 + 8 + 6 + 4 = 666.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 19657 + ... + 22679.

It is an arithmetic number, because the mean of its divisors is an integer number (1781136).

Almost surely, 2^63990864 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 63990864, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (106868160).

63990864 is an abundant number, since it is smaller than the sum of its proper divisors (149745456).

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

63990864 is a wasteful number, since it uses less digits than its factorization.

63990864 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3054 (or 3035 counting only the distinct ones).

The product of its (nonzero) digits is 279936, while the sum is 45.

The square root of 63990864 is about 7999.4289796210. The cubic root of 63990864 is about 399.9809657609.

The spelling of 63990864 in words is "sixty-three million, nine hundred ninety thousand, eight hundred sixty-four".