565668 has 36 divisors (see below), whose sum is σ = 1506960. Its totient is φ = 178416.

The previous prime is 565667. The next prime is 565723. The reversal of 565668 is 866565.

It is a tau number, because it is divible by the number of its divisors (36).

It is a Harshad number since it is a multiple of its sum of digits (36).

It is not an unprimeable number, because it can be changed into a prime (565661) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 271 + ... + 1097.

It is an arithmetic number, because the mean of its divisors is an integer number (41860).

2⁵⁶⁵⁶⁶⁸ is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 565668, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (753480).

565668 is an abundant number, since it is smaller than the sum of its proper divisors (941292).

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

565668 is a wasteful number, since it uses less digits than its factorization.

565668 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 856 (or 851 counting only the distinct ones).

The product of its digits is 43200, while the sum is 36.

The square root of 565668 is about 752.1090346486. The cubic root of 565668 is about 82.7028616503.

The spelling of 565668 in words is "five hundred sixty-five thousand, six hundred sixty-eight".