684304 has 20 divisors (see below), whose sum is σ = 1396240. Its totient is φ = 324000.

The previous prime is 684293. The next prime is 684311. The reversal of 684304 is 403486.

It is a nialpdrome in base 16.

It is an unprimeable number.

684304 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 (7) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 822 + ... + 1429.

It is an arithmetic number, because the mean of its divisors is an integer number (69812).

2⁶⁸⁴³⁰⁴ is an apocalyptic number.

It is an amenable number.

684304 is an abundant number, since it is smaller than the sum of its proper divisors (711936).

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

684304 is a wasteful number, since it uses less digits than its factorization.

684304 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2278 (or 2272 counting only the distinct ones).

The product of its (nonzero) digits is 2304, while the sum is 25.

The square root of 684304 is about 827.2266920258. The cubic root of 684304 is about 88.1217323537.

It can be divided in two parts, 684 and 304, that multiplied together give a square (207936 = 456²).

The spelling of 684304 in words is "six hundred eighty-four thousand, three hundred four".