684324 has 18 divisors (see below), whose sum is σ = 1729910. Its totient is φ = 228096.

The previous prime is 684311. The next prime is 684329. The reversal of 684324 is 423486.

It can be written as a sum of positive squares in only one way, i.e., 656100 + 28224 = 810^2 + 168^2 .

It is a tau number, because it is divible by the number of its divisors (18).

It is not an unprimeable number, because it can be changed into a prime (684329) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 9469 + ... + 9540.

2⁶⁸⁴³²⁴ is an apocalyptic number.

It is an amenable number.

684324 is an abundant number, since it is smaller than the sum of its proper divisors (1045586).

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

684324 is a wasteful number, since it uses less digits than its factorization.

684324 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 19019 (or 19014 counting only the distinct ones).

The product of its digits is 4608, while the sum is 27.

The square root of 684324 is about 827.2387805223. The cubic root of 684324 is about 88.1225908501.

The spelling of 684324 in words is "six hundred eighty-four thousand, three hundred twenty-four".