99317988 has 144 divisors (see below), whose sum is σ = 324839424. Its totient is φ = 25777440.

The previous prime is 99317983. The next prime is 99318041. The reversal of 99317988 is 88971399.

It is a Harshad number since it is a multiple of its sum of digits (54).

It is not an unprimeable number, because it can be changed into a prime (99317983) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 74181 + ... + 75507.

Almost surely, 2^99317988 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 99317988, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (162419712).

99317988 is an abundant number, since it is smaller than the sum of its proper divisors (225521436).

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

99317988 is a wasteful number, since it uses less digits than its factorization.

99317988 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1364 (or 1350 counting only the distinct ones).

The product of its digits is 979776, while the sum is 54.

The square root of 99317988 is about 9965.8410583352. The cubic root of 99317988 is about 463.1012689245.

It can be divided in two parts, 993 and 17988, that added together give a palindrome (18981).

The spelling of 99317988 in words is "ninety-nine million, three hundred seventeen thousand, nine hundred eighty-eight".