989180928 has 132 divisors (see below), whose sum is σ = 2876861988. Its totient is φ = 327352320.

The previous prime is 989180911. The next prime is 989180939. The reversal of 989180928 is 829081989.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 230068224 + 759112704 = 15168^2 + 27552^2 .

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 1667800 + ... + 1668392.

It is an arithmetic number, because the mean of its divisors is an integer number (21794409).

Almost surely, 2^989180928 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 989180928, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1438430994).

989180928 is an abundant number, since it is smaller than the sum of its proper divisors (1887681060).

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

989180928 is a wasteful number, since it uses less digits than its factorization.

989180928 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 800 (or 779 counting only the distinct ones).

The product of its (nonzero) digits is 746496, while the sum is 54.

The square root of 989180928 is about 31451.2468433288. The cubic root of 989180928 is about 996.3805581124.

The spelling of 989180928 in words is "nine hundred eighty-nine million, one hundred eighty thousand, nine hundred twenty-eight".