561688 has 16 divisors (see below), whose sum is σ = 1071360. Its totient is φ = 276000.

The previous prime is 561667. The next prime is 561703. The reversal of 561688 is 886165.

It is a happy number.

It is an Ulam number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 88 + ... + 1063.

It is an arithmetic number, because the mean of its divisors is an integer number (66960).

2⁵⁶¹⁶⁸⁸ is an apocalyptic number.

It is an amenable number.

561688 is a deficient number, since it is larger than the sum of its proper divisors (509672).

561688 is a wasteful number, since it uses less digits than its factorization.

561688 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1218 (or 1214 counting only the distinct ones).

The product of its digits is 11520, while the sum is 34.

The square root of 561688 is about 749.4584711643. The cubic root of 561688 is about 82.5084411320.

The spelling of 561688 in words is "five hundred sixty-one thousand, six hundred eighty-eight".