989969988 has 48 divisors (see below), whose sum is σ = 2655765504. Its totient is φ = 281150880.

The previous prime is 989969971. The next prime is 989969989. The reversal of 989969988 is 889969989.

It is not an unprimeable number, because it can be changed into a prime (989969989) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 21258 + ... + 49313.

It is an arithmetic number, because the mean of its divisors is an integer number (55328448).

Almost surely, 2^989969988 is an apocalyptic number.

It is an amenable number.

989969988 is an abundant number, since it is smaller than the sum of its proper divisors (1665795516).

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

989969988 is a wasteful number, since it uses less digits than its factorization.

989969988 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 70752 (or 70750 counting only the distinct ones).

The product of its digits is 181398528, while the sum is 75.

The square root of 989969988 is about 31463.7885195029. The cubic root of 989969988 is about 996.6454220567.

Subtracting from 989969988 its reverse (889969989), we obtain a palindrome (99999999).

The spelling of 989969988 in words is "nine hundred eighty-nine million, nine hundred sixty-nine thousand, nine hundred eighty-eight".