685761 has 4 divisors (see below), whose sum is σ = 914352. Its totient is φ = 457172.

The previous prime is 685759. The next prime is 685781. The reversal of 685761 is 167586.

685761 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 685761 - 2¹ = 685759 is a prime.

It is an Ulam number.

It is a D-number.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 685761.

It is not an unprimeable number, because it can be changed into a prime (685781) 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, 114291 + ... + 114296.

It is an arithmetic number, because the mean of its divisors is an integer number (228588).

2⁶⁸⁵⁷⁶¹ is an apocalyptic number.

It is an amenable number.

685761 is a deficient number, since it is larger than the sum of its proper divisors (228591).

685761 is a wasteful number, since it uses less digits than its factorization.

685761 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 228590.

The product of its digits is 10080, while the sum is 33.

The square root of 685761 is about 828.1068771602. The cubic root of 685761 is about 88.1842300876.

The spelling of 685761 in words is "six hundred eighty-five thousand, seven hundred sixty-one".