565840 has 40 divisors (see below), whose sum is σ = 1437408. Its totient is φ = 205440.

The previous prime is 565813. The next prime is 565849. The reversal of 565840 is 48565.

It is a tau number, because it is divible by the number of its divisors (40).

It is a Smith number, since the sum of its digits (28) coincides with the sum of the digits of its prime factors.

It is a junction number, because it is equal to n+sod(n) for n = 565799 and 565808.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (565849) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 559 + ... + 1201.

2⁵⁶⁵⁸⁴⁰ 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 565840, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (718704).

565840 is an abundant number, since it is smaller than the sum of its proper divisors (871568).

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

565840 is a wasteful number, since it uses less digits than its factorization.

565840 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 667 (or 661 counting only the distinct ones).

The product of its (nonzero) digits is 4800, while the sum is 28.

The square root of 565840 is about 752.2233710807. The cubic root of 565840 is about 82.7112431571.

The spelling of 565840 in words is "five hundred sixty-five thousand, eight hundred forty".