561668 has 6 divisors (see below), whose sum is σ = 982926. Its totient is φ = 280832.

The previous prime is 561667. The next prime is 561703. The reversal of 561668 is 866165.

It can be written as a sum of positive squares in only one way, i.e., 529984 + 31684 = 728^2 + 178^2 .

It is not an unprimeable number, because it can be changed into a prime (561667) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (5) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 70205 + ... + 70212.

It is an arithmetic number, because the mean of its divisors is an integer number (163821).

2⁵⁶¹⁶⁶⁸ is an apocalyptic number.

It is an amenable number.

561668 is a deficient number, since it is larger than the sum of its proper divisors (421258).

561668 is a wasteful number, since it uses less digits than its factorization.

561668 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 140421 (or 140419 counting only the distinct ones).

The product of its digits is 8640, while the sum is 32.

The square root of 561668 is about 749.4451280781. The cubic root of 561668 is about 82.5074618289.

The spelling of 561668 in words is "five hundred sixty-one thousand, six hundred sixty-eight".