8991685980 has 144 divisors (see below), whose sum is σ = 28106900640. Its totient is φ = 2325072384.

The previous prime is 8991685919. The next prime is 8991685999. The reversal of 8991685980 is 895861998.

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 47 ways as a sum of consecutive naturals, for example, 2109091 + ... + 2113349.

It is an arithmetic number, because the mean of its divisors is an integer number (195186810).

Almost surely, 2^8991685980 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 8991685980, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (14053450320).

8991685980 is an abundant number, since it is smaller than the sum of its proper divisors (19115214660).

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

8991685980 is a wasteful number, since it uses less digits than its factorization.

8991685980 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4628 (or 4623 counting only the distinct ones).

The product of its (nonzero) digits is 11197440, while the sum is 63.

The square root of 8991685980 is about 94824.5009478036. The cubic root of 8991685980 is about 2079.4431124415.

The spelling of 8991685980 in words is "eight billion, nine hundred ninety-one million, six hundred eighty-five thousand, nine hundred eighty".