686700 has 108 divisors (see below), whose sum is σ = 2482480. Its totient is φ = 155520.

The previous prime is 686687. The next prime is 686723. The reversal of 686700 is 7686.

It is a hoax number, since the sum of its digits (27) coincides with the sum of the digits of its distinct prime factors.

It is a nialpdrome in base 15.

It is an unprimeable number.

686700 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 35 ways as a sum of consecutive naturals, for example, 6246 + ... + 6354.

2⁶⁸⁶⁷⁰⁰ is an apocalyptic number.

686700 is a gapful number since it is divisible by the number (60) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 686700, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1241240).

686700 is an abundant number, since it is smaller than the sum of its proper divisors (1795780).

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

686700 is a wasteful number, since it uses less digits than its factorization.

686700 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 136 (or 126 counting only the distinct ones).

The product of its (nonzero) digits is 2016, while the sum is 27.

The square root of 686700 is about 828.6736390160. The cubic root of 686700 is about 88.2244614152.

The spelling of 686700 in words is "six hundred eighty-six thousand, seven hundred".