99788899 has 4 divisors (see below), whose sum is σ = 114044464. Its totient is φ = 85533336.

The previous prime is 99788891. The next prime is 99788911. The reversal of 99788899 is 99888799.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 99888799 = 109 ⋅916411.

It is not a de Polignac number, because 99788899 - 2³ = 99788891 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (99788891) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 7127772 + ... + 7127785.

It is an arithmetic number, because the mean of its divisors is an integer number (28511116).

Almost surely, 2^99788899 is an apocalyptic number.

99788899 is a deficient number, since it is larger than the sum of its proper divisors (14255565).

99788899 is a wasteful number, since it uses less digits than its factorization.

99788899 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 14255564.

The product of its digits is 23514624, while the sum is 67.

The square root of 99788899 is about 9989.4393736586. The cubic root of 99788899 is about 463.8320385810.

The spelling of 99788899 in words is "ninety-nine million, seven hundred eighty-eight thousand, eight hundred ninety-nine".