566820 has 72 divisors (see below), whose sum is σ = 1782144. Its totient is φ = 145728.

The previous prime is 566791. The next prime is 566821. The reversal of 566820 is 28665.

It is not an unprimeable number, because it can be changed into a prime (566821) by changing a digit.

566820 is an untouchable number, because it is not equal to the sum of proper divisors of any number.

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 23 ways as a sum of consecutive naturals, for example, 8427 + ... + 8493.

It is an arithmetic number, because the mean of its divisors is an integer number (24752).

2⁵⁶⁶⁸²⁰ 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 566820, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (891072).

566820 is an abundant number, since it is smaller than the sum of its proper divisors (1215324).

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

566820 is a wasteful number, since it uses less digits than its factorization.

566820 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 129 (or 124 counting only the distinct ones).

The product of its (nonzero) digits is 2880, while the sum is 27.

The square root of 566820 is about 752.8744915323. The cubic root of 566820 is about 82.7589658750.

The spelling of 566820 in words is "five hundred sixty-six thousand, eight hundred twenty".