685567 has 4 divisors (see below), whose sum is σ = 693360. Its totient is φ = 677776.

The previous prime is 685547. The next prime is 685591. The reversal of 685567 is 765586.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-685567 is a prime.

It is a super-2 number, since 2×685567² = 940004222978, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (685537) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3763 + ... + 3940.

It is an arithmetic number, because the mean of its divisors is an integer number (173340).

2⁶⁸⁵⁵⁶⁷ is an apocalyptic number.

685567 is a deficient number, since it is larger than the sum of its proper divisors (7793).

685567 is an equidigital number, since it uses as much as digits as its factorization.

685567 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7792.

The product of its digits is 50400, while the sum is 37.

The square root of 685567 is about 827.9897342359. The cubic root of 685567 is about 88.1759136070.

The spelling of 685567 in words is "six hundred eighty-five thousand, five hundred sixty-seven".