63899904 has 36 divisors (see below), whose sum is σ = 170068976. Its totient is φ = 21299712.

The previous prime is 63899887. The next prime is 63899921. The reversal of 63899904 is 40999836.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (63899887) and next prime (63899921).

It is a Harshad number since it is a multiple of its sum of digits (48).

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 40834 + ... + 42369.

Almost surely, 2^63899904 is an apocalyptic number.

63899904 is a gapful number since it is divisible by the number (64) formed by its first and last digit.

It is an amenable number.

63899904 is an abundant number, since it is smaller than the sum of its proper divisors (106169072).

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

63899904 is an equidigital number, since it uses as much as digits as its factorization.

63899904 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 83222 (or 83208 counting only the distinct ones).

The product of its (nonzero) digits is 419904, while the sum is 48.

The square root of 63899904 is about 7993.7415519893. The cubic root of 63899904 is about 399.7913578567.

The spelling of 63899904 in words is "sixty-three million, eight hundred ninety-nine thousand, nine hundred four".