89988999 has 4 divisors (see below), whose sum is σ = 119985336. Its totient is φ = 59992664.

The previous prime is 89988971. The next prime is 89989051. The reversal of 89988999 is 99988998.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 89988999 - 2⁵ = 89988967 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (89988919) 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, 14998164 + ... + 14998169.

It is an arithmetic number, because the mean of its divisors is an integer number (29996334).

Almost surely, 2^89988999 is an apocalyptic number.

89988999 is a deficient number, since it is larger than the sum of its proper divisors (29996337).

89988999 is a wasteful number, since it uses less digits than its factorization.

89988999 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 29996336.

The product of its digits is 30233088, while the sum is 69.

The square root of 89988999 is about 9486.2531591772. The cubic root of 89988999 is about 448.1222146770.

Subtracting 89988999 from its reverse (99988998), we obtain a palindrome (9999999).

It can be divided in two parts, 899 and 88999, that added together give a palindrome (89898).

The spelling of 89988999 in words is "eighty-nine million, nine hundred eighty-eight thousand, nine hundred ninety-nine".