89878989 has 8 divisors (see below), whose sum is σ = 120501472. Its totient is φ = 59587920.

The previous prime is 89878981. The next prime is 89879039. The reversal of 89878989 is 98987898.

89878989 is an esthetic number in base 10, because in such base its adjacent digits differ by 1.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 89878989 - 2³ = 89878981 is a prime.

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

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (89878981) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 82219 + ... + 83304.

It is an arithmetic number, because the mean of its divisors is an integer number (15062684).

Almost surely, 2^89878989 is an apocalyptic number.

It is an amenable number.

89878989 is a deficient number, since it is larger than the sum of its proper divisors (30622483).

89878989 is a wasteful number, since it uses less digits than its factorization.

89878989 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 165707.

The product of its digits is 20901888, while the sum is 66.

The square root of 89878989 is about 9480.4529955061. The cubic root of 89878989 is about 447.9395329876.

The spelling of 89878989 in words is "eighty-nine million, eight hundred seventy-eight thousand, nine hundred eighty-nine".