8091720 has 288 divisors, whose sum is σ = 34257600. Its totient is φ = 1617408.

The previous prime is 8091703. The next prime is 8091731. The reversal of 8091720 is 271908.

8091720 is digitally balanced in base 4, because in such base it contains all the possibile digits an equal number of times.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 71 ways as a sum of consecutive naturals, for example, 425871 + ... + 425889.

It is an arithmetic number, because the mean of its divisors is an integer number (118950).

Almost surely, 2^8091720 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 8091720, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (17128800).

8091720 is an abundant number, since it is smaller than the sum of its proper divisors (26165880).

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

8091720 is a wasteful number, since it uses less digits than its factorization.

8091720 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 69 (or 49 counting only the distinct ones).

The product of its (nonzero) digits is 1008, while the sum is 27.

The square root of 8091720 is about 2844.5948744944. The cubic root of 8091720 is about 200.7614307704.

The spelling of 8091720 in words is "eight million, ninety-one thousand, seven hundred twenty".