89818989 has 16 divisors (see below), whose sum is σ = 129360000. Its totient is φ = 55106496.

The previous prime is 89818969. The next prime is 89819029. The reversal of 89818989 is 98981898.

It is not a de Polignac number, because 89818989 - 2⁵ = 89818957 is a prime.

It is an alternating number because its digits alternate between even and odd.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (89818969) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 10312 + ... + 16910.

It is an arithmetic number, because the mean of its divisors is an integer number (8085000).

Almost surely, 2^89818989 is an apocalyptic number.

It is an amenable number.

89818989 is a deficient number, since it is larger than the sum of its proper divisors (39541011).

89818989 is a wasteful number, since it uses less digits than its factorization.

89818989 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6964.

The product of its digits is 2985984, while the sum is 60.

The square root of 89818989 is about 9477.2880614657. The cubic root of 89818989 is about 447.8398346596.

The spelling of 89818989 in words is "eighty-nine million, eight hundred eighteen thousand, nine hundred eighty-nine".