99509312 has 56 divisors (see below), whose sum is σ = 226649280. Its totient is φ = 42462720.

The previous prime is 99509299. The next prime is 99509329. The reversal of 99509312 is 21390599.

It is a tau number, because it is divible by the number of its divisors (56).

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 173987 + ... + 174557.

Almost surely, 2^99509312 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 99509312, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (113324640).

99509312 is an abundant number, since it is smaller than the sum of its proper divisors (127139968).

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

99509312 is a wasteful number, since it uses less digits than its factorization.

99509312 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 979 (or 969 counting only the distinct ones).

The product of its (nonzero) digits is 21870, while the sum is 38.

The square root of 99509312 is about 9975.4354290928. The cubic root of 99509312 is about 463.3984475654.

The spelling of 99509312 in words is "ninety-nine million, five hundred nine thousand, three hundred twelve".