99172500 has 120 divisors (see below), whose sum is σ = 330644160. Its totient is φ = 22656000.

The previous prime is 99172439. The next prime is 99172501. The reversal of 99172500 is 527199.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (99172501) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 39 ways as a sum of consecutive naturals, for example, 51556 + ... + 53444.

It is an arithmetic number, because the mean of its divisors is an integer number (2755368).

Almost surely, 2^99172500 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 99172500, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (165322080).

99172500 is an abundant number, since it is smaller than the sum of its proper divisors (231471660).

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

99172500 is a wasteful number, since it uses less digits than its factorization.

99172500 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1923 (or 1906 counting only the distinct ones).

The product of its (nonzero) digits is 5670, while the sum is 33.

The square root of 99172500 is about 9958.5390494791. The cubic root of 99172500 is about 462.8750306084.

Adding to 99172500 its reverse (527199), we get a palindrome (99699699).

The spelling of 99172500 in words is "ninety-nine million, one hundred seventy-two thousand, five hundred".