686565 has 48 divisors (see below), whose sum is σ = 1385280. Its totient is φ = 311040.

The previous prime is 686563. The next prime is 686593. The reversal of 686565 is 565686.

686565 is nontrivially palindromic in base 2.

It is not a de Polignac number, because 686565 - 2¹ = 686563 is a prime.

It is an Ulam number.

686565 is a lucky number.

It is a nialpdrome in base 15.

It is a congruent number.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 686565.

It is not an unprimeable number, because it can be changed into a prime (686563) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 9369 + ... + 9441.

It is an arithmetic number, because the mean of its divisors is an integer number (28860).

2⁶⁸⁶⁵⁶⁵ is an apocalyptic number.

It is an amenable number.

686565 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

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

686565 is a wasteful number, since it uses less digits than its factorization.

686565 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 114 (or 111 counting only the distinct ones).

The product of its digits is 43200, while the sum is 36.

The square root of 686565 is about 828.5921795431. The cubic root of 686565 is about 88.2186796168.

The spelling of 686565 in words is "six hundred eighty-six thousand, five hundred sixty-five".