63865998 has 24 divisors (see below), whose sum is σ = 158144688. Its totient is φ = 18247392.

The previous prime is 63865969. The next prime is 63866003. The reversal of 63865998 is 89956836.

63865998 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 11 ways as a sum of consecutive naturals, for example, 253311 + ... + 253562.

It is an arithmetic number, because the mean of its divisors is an integer number (6589362).

Almost surely, 2^63865998 is an apocalyptic number.

63865998 is an abundant number, since it is smaller than the sum of its proper divisors (94278690).

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

63865998 is a wasteful number, since it uses less digits than its factorization.

63865998 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 506888 (or 506885 counting only the distinct ones).

The product of its digits is 2799360, while the sum is 54.

The square root of 63865998 is about 7991.6204864846. The cubic root of 63865998 is about 399.7206340988.

The spelling of 63865998 in words is "sixty-three million, eight hundred sixty-five thousand, nine hundred ninety-eight".