8090721 has 24 divisors (see below), whose sum is σ = 12340224. Its totient is φ = 5100480.

The previous prime is 8090717. The next prime is 8090741. The reversal of 8090721 is 1270908.

It is not a de Polignac number, because 8090721 - 2² = 8090717 is a prime.

It is not an unprimeable number, because it can be changed into a prime (8090701) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 12805 + ... + 13421.

It is an arithmetic number, because the mean of its divisors is an integer number (514176).

Almost surely, 2^8090721 is an apocalyptic number.

It is an amenable number.

8090721 is a deficient number, since it is larger than the sum of its proper divisors (4249503).

8090721 is a wasteful number, since it uses less digits than its factorization.

8090721 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 701 (or 698 counting only the distinct ones).

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

The square root of 8090721 is about 2844.4192728921. The cubic root of 8090721 is about 200.7531684593.

The spelling of 8090721 in words is "eight million, ninety thousand, seven hundred twenty-one".