89879891 has 4 divisors (see below), whose sum is σ = 91575792. Its totient is φ = 88183992.

The previous prime is 89879887. The next prime is 89879921. The reversal of 89879891 is 19897898.

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 89879891 - 2² = 89879887 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 89879891.

It is not an unprimeable number, because it can be changed into a prime (89879591) 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, 847871 + ... + 847976.

It is an arithmetic number, because the mean of its divisors is an integer number (22893948).

Almost surely, 2^89879891 is an apocalyptic number.

89879891 is a deficient number, since it is larger than the sum of its proper divisors (1695901).

89879891 is a wasteful number, since it uses less digits than its factorization.

89879891 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1695900.

The product of its digits is 2612736, while the sum is 59.

The square root of 89879891 is about 9480.5005669532. The cubic root of 89879891 is about 447.9410314472.

The spelling of 89879891 in words is "eighty-nine million, eight hundred seventy-nine thousand, eight hundred ninety-one".