561804 has 12 divisors (see below), whose sum is σ = 1310904. Its totient is φ = 187264.

The previous prime is 561797. The next prime is 561809. The reversal of 561804 is 408165.

It is a tau number, because it is divible by the number of its divisors (12).

It is not an unprimeable number, because it can be changed into a prime (561809) 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 3 ways as a sum of consecutive naturals, for example, 23397 + ... + 23420.

It is an arithmetic number, because the mean of its divisors is an integer number (109242).

2⁵⁶¹⁸⁰⁴ is an apocalyptic number.

It is an amenable number.

561804 is an abundant number, since it is smaller than the sum of its proper divisors (749100).

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

561804 is a wasteful number, since it uses less digits than its factorization.

561804 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 46824 (or 46822 counting only the distinct ones).

The product of its (nonzero) digits is 960, while the sum is 24.

The square root of 561804 is about 749.5358563805. The cubic root of 561804 is about 82.5141206317.

Adding to 561804 its reverse (408165), we get a palindrome (969969).

The spelling of 561804 in words is "five hundred sixty-one thousand, eight hundred four".