9988489980 has 288 divisors, whose sum is σ = 35393379840. Its totient is φ = 2233059840.

The previous prime is 9988489963. The next prime is 9988490023. The reversal of 9988489980 is 899848899.

9988489980 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a junction number, because it is equal to n+sod(n) for n = 9988489899 and 9988489908.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 95 ways as a sum of consecutive naturals, for example, 15110850 + ... + 15111510.

It is an arithmetic number, because the mean of its divisors is an integer number (122893680).

Almost surely, 2^9988489980 is an apocalyptic number.

9988489980 is a gapful number since it is divisible by the number (90) 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 9988489980, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (17696689920).

9988489980 is an abundant number, since it is smaller than the sum of its proper divisors (25404889860).

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

9988489980 is a wasteful number, since it uses less digits than its factorization.

9988489980 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 929 (or 924 counting only the distinct ones).

The product of its (nonzero) digits is 107495424, while the sum is 72.

The square root of 9988489980 is about 99942.4333303928. The cubic root of 9988489980 is about 2153.6077864824.

The spelling of 9988489980 in words is "nine billion, nine hundred eighty-eight million, four hundred eighty-nine thousand, nine hundred eighty".