989011660 has 72 divisors (see below), whose sum is σ = 2570321376. Its totient is φ = 312998400.

The previous prime is 989011651. The next prime is 989011687. The reversal of 989011660 is 66110989.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 2760 + ... + 44560.

It is an arithmetic number, because the mean of its divisors is an integer number (35698908).

Almost surely, 2^989011660 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 989011660, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1285160688).

989011660 is an abundant number, since it is smaller than the sum of its proper divisors (1581309716).

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

989011660 is a wasteful number, since it uses less digits than its factorization.

989011660 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 41843 (or 41828 counting only the distinct ones).

The product of its (nonzero) digits is 23328, while the sum is 40.

The square root of 989011660 is about 31448.5557697011. Note that the first 3 decimals coincide. The cubic root of 989011660 is about 996.3237215383.

The spelling of 989011660 in words is "nine hundred eighty-nine million, eleven thousand, six hundred sixty".