565520 has 20 divisors (see below), whose sum is σ = 1315020. Its totient is φ = 226176.

The previous prime is 565519. The next prime is 565549. The reversal of 565520 is 25565.

It can be written as a sum of positive squares in 2 ways, for example, as 200704 + 364816 = 448^2 + 604^2 .

It is a tau number, because it is divible by the number of its divisors (20).

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (5) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3455 + ... + 3614.

It is an arithmetic number, because the mean of its divisors is an integer number (65751).

2⁵⁶⁵⁵²⁰ is an apocalyptic number.

It is an amenable number.

565520 is an abundant number, since it is smaller than the sum of its proper divisors (749500).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

565520 is a wasteful number, since it uses less digits than its factorization.

565520 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7082 (or 7076 counting only the distinct ones).

The product of its (nonzero) digits is 1500, while the sum is 23.

The square root of 565520 is about 752.0106382226. The cubic root of 565520 is about 82.6956482959.

The spelling of 565520 in words is "five hundred sixty-five thousand, five hundred twenty".