686775 has 12 divisors (see below), whose sum is σ = 1135592. Its totient is φ = 366240.

The previous prime is 686773. The next prime is 686789. The reversal of 686775 is 577686.

It is not a de Polignac number, because 686775 - 2¹ = 686773 is a prime.

It is a Duffinian 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 686775.

It is not an unprimeable number, because it can be changed into a prime (686773) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 4504 + ... + 4653.

2⁶⁸⁶⁷⁷⁵ is an apocalyptic number.

686775 is a deficient number, since it is larger than the sum of its proper divisors (448817).

686775 is a wasteful number, since it uses less digits than its factorization.

686775 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9170 (or 9165 counting only the distinct ones).

The product of its digits is 70560, while the sum is 39.

The square root of 686775 is about 828.7188908188. The cubic root of 686775 is about 88.2276731980.

The spelling of 686775 in words is "six hundred eighty-six thousand, seven hundred seventy-five".