561662 has 8 divisors (see below), whose sum is σ = 854256. Its totient is φ = 276912.

The previous prime is 561607. The next prime is 561667. The reversal of 561662 is 266165.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a congruent number.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 561662.

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

561662 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 (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1778 + ... + 2069.

It is an arithmetic number, because the mean of its divisors is an integer number (106782).

2⁵⁶¹⁶⁶² is an apocalyptic number.

561662 is a deficient number, since it is larger than the sum of its proper divisors (292594).

561662 is a wasteful number, since it uses less digits than its factorization.

561662 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3922.

The product of its digits is 2160, while the sum is 26.

The square root of 561662 is about 749.4411251059. The cubic root of 561662 is about 82.5071680334.

The spelling of 561662 in words is "five hundred sixty-one thousand, six hundred sixty-two".