685736 has 8 divisors (see below), whose sum is σ = 1285770. Its totient is φ = 342864.

The previous prime is 685733. The next prime is 685739. The reversal of 685736 is 637586.

It is a happy number.

685736 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is an interprime number because it is at equal distance from previous prime (685733) and next prime (685739).

It can be written as a sum of positive squares in only one way, i.e., 649636 + 36100 = 806^2 + 190^2 .

It is a tau number, because it is divible by the number of its divisors (8).

It is a junction number, because it is equal to n+sod(n) for n = 685696 and 685705.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 685736.

It is not an unprimeable number, because it can be changed into a prime (685733) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 42851 + ... + 42866.

2⁶⁸⁵⁷³⁶ is an apocalyptic number.

It is an amenable number.

685736 is a deficient number, since it is larger than the sum of its proper divisors (600034).

685736 is a wasteful number, since it uses less digits than its factorization.

685736 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 85723 (or 85719 counting only the distinct ones).

The product of its digits is 30240, while the sum is 35.

The square root of 685736 is about 828.0917823527. The cubic root of 685736 is about 88.1831584643.

The spelling of 685736 in words is "six hundred eighty-five thousand, seven hundred thirty-six".