89121618 has 48 divisors (see below), whose sum is σ = 199134936. Its totient is φ = 28788480.

The previous prime is 89121607. The next prime is 89121629. The reversal of 89121618 is 81612198.

It is an interprime number because it is at equal distance from previous prime (89121607) and next prime (89121629).

It can be written as a sum of positive squares in 4 ways, for example, as 50594769 + 38526849 = 7113^2 + 6207^2 .

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 145080 + ... + 145692.

Almost surely, 2^89121618 is an apocalyptic number.

89121618 is an abundant number, since it is smaller than the sum of its proper divisors (110013318).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

89121618 is a wasteful number, since it uses less digits than its factorization.

89121618 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 859 (or 856 counting only the distinct ones).

The product of its digits is 6912, while the sum is 36.

The square root of 89121618 is about 9440.4246726511. The cubic root of 89121618 is about 446.6777852978.

The spelling of 89121618 in words is "eighty-nine million, one hundred twenty-one thousand, six hundred eighteen".