686280 has 128 divisors (see below), whose sum is σ = 2534400. Its totient is φ = 145152.

The previous prime is 686269. The next prime is 686293. The reversal of 686280 is 82686.

It is a Harshad number since it is a multiple of its sum of digits (30).

It is a nialpdrome in base 7 and base 15.

It is an unprimeable number.

686280 is an untouchable number, because it is not equal to the sum of proper divisors of any number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 15939 + ... + 15981.

It is an arithmetic number, because the mean of its divisors is an integer number (19800).

2⁶⁸⁶²⁸⁰ is an apocalyptic number.

686280 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 686280, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1267200).

686280 is an abundant number, since it is smaller than the sum of its proper divisors (1848120).

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

686280 is a wasteful number, since it uses less digits than its factorization.

686280 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 83 (or 79 counting only the distinct ones).

The product of its (nonzero) digits is 4608, while the sum is 30.

The square root of 686280 is about 828.4201832404. The cubic root of 686280 is about 88.2064711086.

The spelling of 686280 in words is "six hundred eighty-six thousand, two hundred eighty".