99172224 has 96 divisors (see below), whose sum is σ = 294690240. Its totient is φ = 31979520.

The previous prime is 99172217. The next prime is 99172259. The reversal of 99172224 is 42227199.

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 (36).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 34324 + ... + 37100.

It is an arithmetic number, because the mean of its divisors is an integer number (3069690).

Almost surely, 2^99172224 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 99172224, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (147345120).

99172224 is an abundant number, since it is smaller than the sum of its proper divisors (195518016).

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

99172224 is a wasteful number, since it uses less digits than its factorization.

99172224 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2828 (or 2813 counting only the distinct ones).

The product of its digits is 18144, while the sum is 36.

The square root of 99172224 is about 9958.5251920151. The cubic root of 99172224 is about 462.8746012097.

The spelling of 99172224 in words is "ninety-nine million, one hundred seventy-two thousand, two hundred twenty-four".