561860 has 24 divisors (see below), whose sum is σ = 1271256. Its totient is φ = 207360.

The previous prime is 561839. The next prime is 561907. The reversal of 561860 is 68165.

It can be written as a sum of positive squares in 4 ways, for example, as 20164 + 541696 = 142^2 + 736^2 .

It is a Harshad number since it is a multiple of its sum of digits (26).

It is an unprimeable number.

561860 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 7 ways as a sum of consecutive naturals, for example, 821 + ... + 1340.

It is an arithmetic number, because the mean of its divisors is an integer number (52969).

2⁵⁶¹⁸⁶⁰ is an apocalyptic number.

It is an amenable number.

561860 is an abundant number, since it is smaller than the sum of its proper divisors (709396).

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

561860 is a wasteful number, since it uses less digits than its factorization.

561860 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2183 (or 2181 counting only the distinct ones).

The product of its (nonzero) digits is 1440, while the sum is 26.

The square root of 561860 is about 749.5732119013. The cubic root of 561860 is about 82.5168621793.

The spelling of 561860 in words is "five hundred sixty-one thousand, eight hundred sixty".