99170172 has 36 divisors (see below), whose sum is σ = 251026776. Its totient is φ = 33011040.

The previous prime is 99170167. The next prime is 99170179. The reversal of 99170172 is 27107199.

It is a tau number, because it is divible by the number of its divisors (36).

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (99170179) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 33538 + ... + 36374.

It is an arithmetic number, because the mean of its divisors is an integer number (6972966).

Almost surely, 2^99170172 is an apocalyptic number.

It is an amenable number.

99170172 is an abundant number, since it is smaller than the sum of its proper divisors (151856604).

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

99170172 is a wasteful number, since it uses less digits than its factorization.

99170172 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3818 (or 3813 counting only the distinct ones).

The product of its (nonzero) digits is 7938, while the sum is 36.

The square root of 99170172 is about 9958.4221641784. The cubic root of 99170172 is about 462.8714086987.

The spelling of 99170172 in words is "ninety-nine million, one hundred seventy thousand, one hundred seventy-two".