685766 has 8 divisors (see below), whose sum is σ = 1053864. Its totient is φ = 334480.

The previous prime is 685759. The next prime is 685781. The reversal of 685766 is 667586.

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 685766.

It is an unprimeable number.

685766 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, 4100 + ... + 4263.

It is an arithmetic number, because the mean of its divisors is an integer number (131733).

2⁶⁸⁵⁷⁶⁶ is an apocalyptic number.

685766 is a deficient number, since it is larger than the sum of its proper divisors (368098).

685766 is a wasteful number, since it uses less digits than its factorization.

685766 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8406.

The product of its digits is 60480, while the sum is 38.

The square root of 685766 is about 828.1098960887. The cubic root of 685766 is about 88.1844444092.

The spelling of 685766 in words is "six hundred eighty-five thousand, seven hundred sixty-six".