686870 has 8 divisors (see below), whose sum is σ = 1236384. Its totient is φ = 274744.

The previous prime is 686863. The next prime is 686879. The reversal of 686870 is 78686.

It is a sphenic number, since it is the product of 3 distinct primes.

It is an Ulam number.

It is a self number, because there is not a number n which added to its sum of digits gives 686870.

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 686870.

It is not an unprimeable number, because it can be changed into a prime (686879) by changing a digit.

686870 is an untouchable number, because it is not equal to the sum of proper divisors of any number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 34334 + ... + 34353.

It is an arithmetic number, because the mean of its divisors is an integer number (154548).

2⁶⁸⁶⁸⁷⁰ is an apocalyptic number.

686870 is a deficient number, since it is larger than the sum of its proper divisors (549514).

686870 is a wasteful number, since it uses less digits than its factorization.

686870 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 68694.

The product of its (nonzero) digits is 16128, while the sum is 35.

The square root of 686870 is about 828.7762062222. The cubic root of 686870 is about 88.2317411205.

The spelling of 686870 in words is "six hundred eighty-six thousand, eight hundred seventy".