89019978 has 16 divisors (see below), whose sum is σ = 187410720. Its totient is φ = 28111536.

The previous prime is 89019971. The next prime is 89020027. The reversal of 89019978 is 87991098.

It is a self number, because there is not a number n which added to its sum of digits gives 89019978.

It is not an unprimeable number, because it can be changed into a prime (89019971) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 390325 + ... + 390552.

It is an arithmetic number, because the mean of its divisors is an integer number (11713170).

Almost surely, 2^89019978 is an apocalyptic number.

89019978 is an abundant number, since it is smaller than the sum of its proper divisors (98390742).

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

89019978 is a wasteful number, since it uses less digits than its factorization.

89019978 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 780901.

The product of its (nonzero) digits is 326592, while the sum is 51.

The square root of 89019978 is about 9435.0399045261. The cubic root of 89019978 is about 446.5079140544.

The spelling of 89019978 in words is "eighty-nine million, nineteen thousand, nine hundred seventy-eight".