689566 has 8 divisors (see below), whose sum is σ = 1037880. Its totient is φ = 343608.

The previous prime is 689561. The next prime is 689581. The reversal of 689566 is 665986.

689566 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (689561) by changing a digit.

689566 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 3 ways as a sum of consecutive naturals, for example, 805 + ... + 1423.

It is an arithmetic number, because the mean of its divisors is an integer number (129735).

2⁶⁸⁹⁵⁶⁶ is an apocalyptic number.

689566 is a deficient number, since it is larger than the sum of its proper divisors (348314).

689566 is a wasteful number, since it uses less digits than its factorization.

689566 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1178.

The product of its digits is 77760, while the sum is 40.

The square root of 689566 is about 830.4011078991. The cubic root of 689566 is about 88.3470284529.

The spelling of 689566 in words is "six hundred eighty-nine thousand, five hundred sixty-six".