685711 has 4 divisors (see below), whose sum is σ = 738472. Its totient is φ = 632952.

The previous prime is 685697. The next prime is 685717. The reversal of 685711 is 117586.

It is a happy number.

685711 is nontrivially palindromic in base 3.

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

It is a cyclic number.

It is not a de Polignac number, because 685711 - 2⁵ = 685679 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 685711.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (685717) 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, 26361 + ... + 26386.

It is an arithmetic number, because the mean of its divisors is an integer number (184618).

2⁶⁸⁵⁷¹¹ is an apocalyptic number.

685711 is a deficient number, since it is larger than the sum of its proper divisors (52761).

685711 is a wasteful number, since it uses less digits than its factorization.

685711 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 52760.

The product of its digits is 1680, while the sum is 28.

The square root of 685711 is about 828.0766872700. The cubic root of 685711 is about 88.1820868148.

The spelling of 685711 in words is "six hundred eighty-five thousand, seven hundred eleven".