989921280 has 272 divisors, whose sum is σ = 3397360320. Its totient is φ = 245366784.

The previous prime is 989921269. The next prime is 989921327. The reversal of 989921280 is 82129989.

It is a Harshad number since it is a multiple of its sum of digits (48).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 18677734 + ... + 18677786.

Almost surely, 2^989921280 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 989921280, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1698680160).

989921280 is an abundant number, since it is smaller than the sum of its proper divisors (2407439040).

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

989921280 is an equidigital number, since it uses as much as digits as its factorization.

989921280 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 112 (or 82 counting only the distinct ones).

The product of its (nonzero) digits is 186624, while the sum is 48.

The square root of 989921280 is about 31463.0144773192. The cubic root of 989921280 is about 996.6290763082.

The spelling of 989921280 in words is "nine hundred eighty-nine million, nine hundred twenty-one thousand, two hundred eighty".