8791205720 has 64 divisors (see below), whose sum is σ = 21608259840. Its totient is φ = 3192380800.

The previous prime is 8791205701. The next prime is 8791205723. The reversal of 8791205720 is 275021978.

It is a super-2 number, since 2×8791205720² (a number of 21 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (8791205723) by changing a digit.

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 15 ways as a sum of consecutive naturals, for example, 313475 + ... + 340365.

It is an arithmetic number, because the mean of its divisors is an integer number (337629060).

Almost surely, 2^8791205720 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 8791205720, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (10804129920).

8791205720 is an abundant number, since it is smaller than the sum of its proper divisors (12817054120).

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

8791205720 is a wasteful number, since it uses less digits than its factorization.

8791205720 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 27656 (or 27652 counting only the distinct ones).

The product of its (nonzero) digits is 70560, while the sum is 41.

The square root of 8791205720 is about 93761.4298099170. The cubic root of 8791205720 is about 2063.8722622657.

The spelling of 8791205720 in words is "eight billion, seven hundred ninety-one million, two hundred five thousand, seven hundred twenty".