561568 has 48 divisors (see below), whose sum is σ = 1330560. Its totient is φ = 228096.

The previous prime is 561559. The next prime is 561599. The reversal of 561568 is 865165.

It is an unprimeable number.

561568 is an untouchable number, because it is not equal to the sum of proper divisors of any number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 5098 + ... + 5206.

It is an arithmetic number, because the mean of its divisors is an integer number (27720).

2⁵⁶¹⁵⁶⁸ 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 561568, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (665280).

561568 is an abundant number, since it is smaller than the sum of its proper divisors (768992).

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

561568 is a wasteful number, since it uses less digits than its factorization.

561568 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 149 (or 141 counting only the distinct ones).

The product of its digits is 7200, while the sum is 31.

The square root of 561568 is about 749.3784090832. The cubic root of 561568 is about 82.5025649646.

The spelling of 561568 in words is "five hundred sixty-one thousand, five hundred sixty-eight".