684280 has 16 divisors (see below), whose sum is σ = 1539720. Its totient is φ = 273696.

The previous prime is 684269. The next prime is 684287. The reversal of 684280 is 82486.

684280 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 (684287) 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, 8514 + ... + 8593.

2⁶⁸⁴²⁸⁰ is an apocalyptic number.

It is an amenable number.

684280 is an abundant number, since it is smaller than the sum of its proper divisors (855440).

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

684280 is a wasteful number, since it uses less digits than its factorization.

684280 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 17118 (or 17114 counting only the distinct ones).

The product of its (nonzero) digits is 3072, while the sum is 28.

The square root of 684280 is about 827.2121855969. The cubic root of 684280 is about 88.1207021360.

The spelling of 684280 in words is "six hundred eighty-four thousand, two hundred eighty".