63999872 has 48 divisors (see below), whose sum is σ = 132657120. Its totient is φ = 30723840.

The previous prime is 63999833. The next prime is 63999907. The reversal of 63999872 is 27899936.

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 5 ways as a sum of consecutive naturals, for example, 503873 + ... + 503999.

It is an arithmetic number, because the mean of its divisors is an integer number (2763690).

Almost surely, 2^63999872 is an apocalyptic number.

63999872 is a gapful number since it is divisible by the number (62) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 63999872, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (66328560).

63999872 is an abundant number, since it is smaller than the sum of its proper divisors (68657248).

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

63999872 is an equidigital number, since it uses as much as digits as its factorization.

63999872 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 299 (or 160 counting only the distinct ones).

The product of its digits is 1469664, while the sum is 53.

The square root of 63999872 is about 7999.9919999960. The cubic root of 63999872 is about 399.9997333332. Note that the first 3 decimals are identical.

The spelling of 63999872 in words is "sixty-three million, nine hundred ninety-nine thousand, eight hundred seventy-two".