9720565 has 4 divisors (see below), whose sum is σ = 11664684. Its totient is φ = 7776448.

The previous prime is 9720551. The next prime is 9720589. The reversal of 9720565 is 5650279.

9720565 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 4955076 + 4765489 = 2226^2 + 2183^2 .

It is a cyclic number.

It is not a de Polignac number, because 9720565 - 2⁷ = 9720437 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 9720565.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 972052 + ... + 972061.

It is an arithmetic number, because the mean of its divisors is an integer number (2916171).

Almost surely, 2^9720565 is an apocalyptic number.

It is an amenable number.

9720565 is a deficient number, since it is larger than the sum of its proper divisors (1944119).

9720565 is a wasteful number, since it uses less digits than its factorization.

9720565 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1944118.

The product of its (nonzero) digits is 18900, while the sum is 34.

The square root of 9720565 is about 3117.7820642245. The cubic root of 9720565 is about 213.4177332607.

The spelling of 9720565 in words is "nine million, seven hundred twenty thousand, five hundred sixty-five".