99609172 has 48 divisors (see below), whose sum is σ = 202507200. Its totient is φ = 42474240.

The previous prime is 99609163. The next prime is 99609173. The reversal of 99609172 is 27190699.

It is a Smith number, since the sum of its digits (43) coincides with the sum of the digits of its prime factors.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (99609173) 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 15 ways as a sum of consecutive naturals, for example, 39279 + ... + 41737.

It is an arithmetic number, because the mean of its divisors is an integer number (4218900).

Almost surely, 2^99609172 is an apocalyptic number.

It is an amenable number.

99609172 is an abundant number, since it is smaller than the sum of its proper divisors (102898028).

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

99609172 is a wasteful number, since it uses less digits than its factorization.

99609172 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2536 (or 2534 counting only the distinct ones).

The product of its (nonzero) digits is 61236, while the sum is 43.

The square root of 99609172 is about 9980.4394692819. The cubic root of 99609172 is about 463.5534062566.

The spelling of 99609172 in words is "ninety-nine million, six hundred nine thousand, one hundred seventy-two".