989979928 has 48 divisors (see below), whose sum is σ = 2169682200. Its totient is φ = 422231040.

The previous prime is 989979923. The next prime is 989979929. The reversal of 989979928 is 829979989.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (989979923) 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 11 ways as a sum of consecutive naturals, for example, 76728 + ... + 88696.

Almost surely, 2^989979928 is an apocalyptic number.

989979928 is a gapful number since it is divisible by the number (98) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 989979928, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1084841100).

989979928 is an abundant number, since it is smaller than the sum of its proper divisors (1179702272).

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

989979928 is a wasteful number, since it uses less digits than its factorization.

989979928 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12200 (or 12189 counting only the distinct ones).

The product of its digits is 52907904, while the sum is 70.

The square root of 989979928 is about 31463.9464784696. The cubic root of 989979928 is about 996.6487577209.

The spelling of 989979928 in words is "nine hundred eighty-nine million, nine hundred seventy-nine thousand, nine hundred twenty-eight".