685756 has 6 divisors (see below), whose sum is σ = 1200080. Its totient is φ = 342876.

The previous prime is 685753. The next prime is 685759. The reversal of 685756 is 657586.

It is an interprime number because it is at equal distance from previous prime (685753) and next prime (685759).

It is a super-2 number, since 2×685756² = 940522583072, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (685753) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 85716 + ... + 85723.

2⁶⁸⁵⁷⁵⁶ is an apocalyptic number.

It is an amenable number.

685756 is a deficient number, since it is larger than the sum of its proper divisors (514324).

685756 is a wasteful number, since it uses less digits than its factorization.

685756 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 171443 (or 171441 counting only the distinct ones).

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

The square root of 685756 is about 828.1038582207. The cubic root of 685756 is about 88.1840157650.

It can be divided in two parts, 685 and 756, that added together give a palindrome (1441).

The spelling of 685756 in words is "six hundred eighty-five thousand, seven hundred fifty-six".