99117642 has 64 divisors (see below), whose sum is σ = 229662720. Its totient is φ = 28257984.

The previous prime is 99117617. The next prime is 99117647. The reversal of 99117642 is 24671199.

It is a Harshad number since it is a multiple of its sum of digits (39).

It is a self number, because there is not a number n which added to its sum of digits gives 99117642.

It is not an unprimeable number, because it can be changed into a prime (99117647) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 68943 + ... + 70365.

It is an arithmetic number, because the mean of its divisors is an integer number (3588480).

Almost surely, 2^99117642 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 99117642, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (114831360).

99117642 is an abundant number, since it is smaller than the sum of its proper divisors (130545078).

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

99117642 is a wasteful number, since it uses less digits than its factorization.

99117642 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1507.

The product of its digits is 27216, while the sum is 39.

The square root of 99117642 is about 9955.7843488095. The cubic root of 99117642 is about 462.7896672873.

The spelling of 99117642 in words is "ninety-nine million, one hundred seventeen thousand, six hundred forty-two".