63999264 has 96 divisors (see below), whose sum is σ = 193729536. Its totient is φ = 18120960.

The previous prime is 63999263. The next prime is 63999269. The reversal of 63999264 is 46299936.

It is a tau number, because it is divible by the number of its divisors (96).

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

It is not an unprimeable number, because it can be changed into a prime (63999263) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 87669 + ... + 88395.

It is an arithmetic number, because the mean of its divisors is an integer number (2018016).

Almost surely, 2^63999264 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 63999264, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (96864768).

63999264 is an abundant number, since it is smaller than the sum of its proper divisors (129730272).

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

63999264 is a wasteful number, since it uses less digits than its factorization.

63999264 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 878 (or 870 counting only the distinct ones).

The product of its digits is 629856, while the sum is 48.

The square root of 63999264 is about 7999.9539998677. The cubic root of 63999264 is about 399.9984666608.

The spelling of 63999264 in words is "sixty-three million, nine hundred ninety-nine thousand, two hundred sixty-four".