686056 has 16 divisors (see below), whose sum is σ = 1470240. Its totient is φ = 294000.

The previous prime is 686051. The next prime is 686057. The reversal of 686056 is 650686.

It is a nialpdrome in base 7 and base 15.

It is not an unprimeable number, because it can be changed into a prime (686051) by changing a digit.

686056 is an untouchable number, because it is not equal to the sum of proper divisors of any number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 6070 + ... + 6181.

It is an arithmetic number, because the mean of its divisors is an integer number (91890).

2⁶⁸⁶⁰⁵⁶ is an apocalyptic number.

It is an amenable number.

686056 is an abundant number, since it is smaller than the sum of its proper divisors (784184).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

686056 is a wasteful number, since it uses less digits than its factorization.

686056 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12264 (or 12260 counting only the distinct ones).

The product of its (nonzero) digits is 8640, while the sum is 31.

The square root of 686056 is about 828.2849751142. The cubic root of 686056 is about 88.1968732770.

The spelling of 686056 in words is "six hundred eighty-six thousand, fifty-six".