989789221980 has 288 divisors, whose sum is σ = 3353481750528. Its totient is φ = 234659980800.

The previous prime is 989789221943. The next prime is 989789221997. The reversal of 989789221980 is 89122987989.

It is a junction number, because it is equal to n+sod(n) for n = 989789221899 and 989789221908.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 95 ways as a sum of consecutive naturals, for example, 15273607 + ... + 15338273.

It is an arithmetic number, because the mean of its divisors is an integer number (11644033856).

Almost surely, 2^989789221980 is an apocalyptic number.

989789221980 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 989789221980, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1676740875264).

989789221980 is an abundant number, since it is smaller than the sum of its proper divisors (2363692528548).

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

989789221980 is a wasteful number, since it uses less digits than its factorization.

989789221980 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 64937 (or 64932 counting only the distinct ones).

The product of its (nonzero) digits is 94058496, while the sum is 72.

The spelling of 989789221980 in words is "nine hundred eighty-nine billion, seven hundred eighty-nine million, two hundred twenty-one thousand, nine hundred eighty".