99639264 has 48 divisors (see below), whose sum is σ = 262846080. Its totient is φ = 33048960.

The previous prime is 99639257. The next prime is 99639269. The reversal of 99639264 is 46293699.

It is a tau number, because it is divible by the number of its divisors (48).

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

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (99639269) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 17797 + ... + 22715.

It is an arithmetic number, because the mean of its divisors is an integer number (5475960).

Almost surely, 2^99639264 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 99639264, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (131423040).

99639264 is an abundant number, since it is smaller than the sum of its proper divisors (163206816).

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

99639264 is a wasteful number, since it uses less digits than its factorization.

99639264 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5143 (or 5135 counting only the distinct ones).

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

The square root of 99639264 is about 9981.9469042868. The cubic root of 99639264 is about 463.6000814920.

The spelling of 99639264 in words is "ninety-nine million, six hundred thirty-nine thousand, two hundred sixty-four".