989878988 has 18 divisors (see below), whose sum is σ = 2015111196. Its totient is φ = 424233768.

The previous prime is 989878979. The next prime is 989878997. The reversal of 989878988 is 889878989.

It is an interprime number because it is at equal distance from previous prime (989878979) and next prime (989878997).

It is an unprimeable number.

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 5 ways as a sum of consecutive naturals, for example, 2525006 + ... + 2525397.

It is an arithmetic number, because the mean of its divisors is an integer number (111950622).

Almost surely, 2^989878988 is an apocalyptic number.

989878988 is a gapful number since it is divisible by the number (98) formed by its first and last digit.

It is an amenable number.

989878988 is an abundant number, since it is smaller than the sum of its proper divisors (1025232208).

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

989878988 is a wasteful number, since it uses less digits than its factorization.

989878988 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5050421 (or 5050412 counting only the distinct ones).

The product of its digits is 167215104, while the sum is 74.

The square root of 989878988 is about 31462.3423794224. The cubic root of 989878988 is about 996.6148832479.

Subtracting from 989878988 its reverse (889878989), we obtain a palindrome (99999999).

The spelling of 989878988 in words is "nine hundred eighty-nine million, eight hundred seventy-eight thousand, nine hundred eighty-eight".