684220 has 12 divisors (see below), whose sum is σ = 1436904. Its totient is φ = 273680.

The previous prime is 684217. The next prime is 684221. The reversal of 684220 is 22486.

684220 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a junction number, because it is equal to n+sod(n) for n = 684191 and 684200.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (684221) 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, 17086 + ... + 17125.

It is an arithmetic number, because the mean of its divisors is an integer number (119742).

2⁶⁸⁴²²⁰ is an apocalyptic number.

It is an amenable number.

684220 is an abundant number, since it is smaller than the sum of its proper divisors (752684).

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

684220 is a wasteful number, since it uses less digits than its factorization.

684220 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 34220 (or 34218 counting only the distinct ones).

The product of its (nonzero) digits is 768, while the sum is 22.

The square root of 684220 is about 827.1759184116. The cubic root of 684220 is about 88.1181264863.

The spelling of 684220 in words is "six hundred eighty-four thousand, two hundred twenty".