720506565 has 12 divisors (see below), whose sum is σ = 1248878124. Its totient is φ = 384270144.

The previous prime is 720506503. The next prime is 720506573. The reversal of 720506565 is 565605027.

720506565 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 2 ways, for example, as 353477601 + 367028964 = 18801^2 + 19158^2 .

It is not a de Polignac number, because 720506565 - 2¹⁵ = 720473797 is a prime.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 8005584 + ... + 8005673.

It is an arithmetic number, because the mean of its divisors is an integer number (104073177).

Almost surely, 2^720506565 is an apocalyptic number.

It is an amenable number.

720506565 is a deficient number, since it is larger than the sum of its proper divisors (528371559).

720506565 is a wasteful number, since it uses less digits than its factorization.

720506565 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 16011268 (or 16011265 counting only the distinct ones).

The product of its (nonzero) digits is 63000, while the sum is 36.

The square root of 720506565 is about 26842.2533517587. The cubic root of 720506565 is about 896.4910965904.

The spelling of 720506565 in words is "seven hundred twenty million, five hundred six thousand, five hundred sixty-five".