686872 has 16 divisors (see below), whose sum is σ = 1344240. Its totient is φ = 328416.

The previous prime is 686863. The next prime is 686879. The reversal of 686872 is 278686.

686872 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a congruent number.

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

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1683 + ... + 2050.

It is an arithmetic number, because the mean of its divisors is an integer number (84015).

2⁶⁸⁶⁸⁷² is an apocalyptic number.

It is an amenable number.

686872 is a deficient number, since it is larger than the sum of its proper divisors (657368).

686872 is a wasteful number, since it uses less digits than its factorization.

686872 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3762 (or 3758 counting only the distinct ones).

The product of its digits is 32256, while the sum is 37.

The square root of 686872 is about 828.7774128196. Note that the first 3 decimals coincide. The cubic root of 686872 is about 88.2318267570.

The spelling of 686872 in words is "six hundred eighty-six thousand, eight hundred seventy-two".