8720065 has 16 divisors (see below), whose sum is σ = 11162448. Its totient is φ = 6516736.

The previous prime is 8720057. The next prime is 8720071. The reversal of 8720065 is 5600278.

It can be written as a sum of positive squares in 8 ways, for example, as 1168561 + 7551504 = 1081^2 + 2748^2 .

It is a cyclic number.

It is not a de Polignac number, because 8720065 - 2³ = 8720057 is a prime.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 14409 + ... + 15001.

It is an arithmetic number, because the mean of its divisors is an integer number (697653).

Almost surely, 2^8720065 is an apocalyptic number.

8720065 is a gapful number since it is divisible by the number (85) formed by its first and last digit.

It is an amenable number.

8720065 is a deficient number, since it is larger than the sum of its proper divisors (2442383).

8720065 is a wasteful number, since it uses less digits than its factorization.

8720065 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 788.

The product of its (nonzero) digits is 3360, while the sum is 28.

The square root of 8720065 is about 2952.9756179149. The cubic root of 8720065 is about 205.8290047370.

The spelling of 8720065 in words is "eight million, seven hundred twenty thousand, sixty-five".