989845978 has 64 divisors (see below), whose sum is σ = 1774700928. Its totient is φ = 408913920.

The previous prime is 989845973. The next prime is 989845981. The reversal of 989845978 is 879548989.

It is not an unprimeable number, because it can be changed into a prime (989845973) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 3224101 + ... + 3224407.

It is an arithmetic number, because the mean of its divisors is an integer number (27729702).

Almost surely, 2^989845978 is an apocalyptic number.

989845978 is a deficient number, since it is larger than the sum of its proper divisors (784854950).

989845978 is a wasteful number, since it uses less digits than its factorization.

989845978 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 607.

The product of its digits is 52254720, while the sum is 67.

The square root of 989845978 is about 31461.8177796516. The cubic root of 989845978 is about 996.6038049164.

The spelling of 989845978 in words is "nine hundred eighty-nine million, eight hundred forty-five thousand, nine hundred seventy-eight".