8720565 has 48 divisors (see below), whose sum is σ = 16775808. Its totient is φ = 3788928.

The previous prime is 8720557. The next prime is 8720581. The reversal of 8720565 is 5650278.

It is a happy number.

It is not a de Polignac number, because 8720565 - 2³ = 8720557 is a prime.

It is a hoax number, since the sum of its digits (33) coincides with the sum of the digits of its distinct prime factors.

It is a Curzon number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 55467 + ... + 55623.

It is an arithmetic number, because the mean of its divisors is an integer number (349496).

Almost surely, 2^8720565 is an apocalyptic number.

It is an amenable number.

8720565 is a deficient number, since it is larger than the sum of its proper divisors (8055243).

8720565 is a wasteful number, since it uses less digits than its factorization.

8720565 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 218 (or 195 counting only the distinct ones).

The product of its (nonzero) digits is 16800, while the sum is 33.

The square root of 8720565 is about 2953.0602770685. The cubic root of 8720565 is about 205.8329386731.

The spelling of 8720565 in words is "eight million, seven hundred twenty thousand, five hundred sixty-five".