63999680 has 28 divisors (see below), whose sum is σ = 152400000. Its totient is φ = 25599744.

The previous prime is 63999671. The next prime is 63999701. The reversal of 63999680 is 8699936.

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 3 ways as a sum of consecutive naturals, for example, 99680 + ... + 100319.

Almost surely, 2^63999680 is an apocalyptic number.

It is an amenable number.

63999680 is an abundant number, since it is smaller than the sum of its proper divisors (88400320).

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

63999680 is a wasteful number, since it uses less digits than its factorization.

63999680 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 200016 (or 200006 counting only the distinct ones).

The product of its (nonzero) digits is 629856, while the sum is 50.

The square root of 63999680 is about 7999.9799999750. The cubic root of 63999680 is about 399.9993333322. Note that the first 3 decimals are identical.

The spelling of 63999680 in words is "sixty-three million, nine hundred ninety-nine thousand, six hundred eighty".