89999989 has 32 divisors (see below), whose sum is σ = 104696064. Its totient is φ = 76876800.

The previous prime is 89999983. The next prime is 89999999. The reversal of 89999989 is 98999998.

It is a cyclic number.

It is not a de Polignac number, because 89999989 - 2³ = 89999981 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (89999981) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 891039 + ... + 891139.

It is an arithmetic number, because the mean of its divisors is an integer number (3271752).

Almost surely, 2^89999989 is an apocalyptic number.

It is an amenable number.

89999989 is a deficient number, since it is larger than the sum of its proper divisors (14696075).

89999989 is a wasteful number, since it uses less digits than its factorization.

89999989 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 237.

The product of its digits is 34012224, while the sum is 70.

The square root of 89999989 is about 9486.8324007542. The cubic root of 89999989 is about 448.1404563981.

Subtracting 89999989 from its reverse (98999998), we obtain a palindrome (9000009).

The spelling of 89999989 in words is "eighty-nine million, nine hundred ninety-nine thousand, nine hundred eighty-nine".