8791999020 has 216 divisors, whose sum is σ = 31569973344. Its totient is φ = 1940069376.

The previous prime is 8791999003. The next prime is 8791999043. The reversal of 8791999020 is 209991978.

It is a hoax number, since the sum of its digits (54) coincides with the sum of the digits of its distinct prime factors.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 71 ways as a sum of consecutive naturals, for example, 1055512 + ... + 1063808.

It is an arithmetic number, because the mean of its divisors is an integer number (146157284).

Almost surely, 2^8791999020 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 8791999020, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (15784986672).

8791999020 is an abundant number, since it is smaller than the sum of its proper divisors (22777974324).

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

8791999020 is a wasteful number, since it uses less digits than its factorization.

8791999020 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8377 (or 8343 counting only the distinct ones).

The product of its (nonzero) digits is 734832, while the sum is 54.

The square root of 8791999020 is about 93765.6601320547. The cubic root of 8791999020 is about 2063.9343402359.

The spelling of 8791999020 in words is "eight billion, seven hundred ninety-one million, nine hundred ninety-nine thousand, twenty".