684678 has 8 divisors (see below), whose sum is σ = 1369368. Its totient is φ = 228224.

The previous prime is 684647. The next prime is 684683. The reversal of 684678 is 876486.

It is a sphenic number, since it is the product of 3 distinct primes.

684678 is an admirable number.

It is a congruent number.

It is an unprimeable number.

684678 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 3 ways as a sum of consecutive naturals, for example, 57051 + ... + 57062.

It is an arithmetic number, because the mean of its divisors is an integer number (171171).

2⁶⁸⁴⁶⁷⁸ is an apocalyptic number.

684678 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

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

684678 is a wasteful number, since it uses less digits than its factorization.

684678 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 114118.

The product of its digits is 64512, while the sum is 39.

The square root of 684678 is about 827.4527176824. The cubic root of 684678 is about 88.1377834682.

The spelling of 684678 in words is "six hundred eighty-four thousand, six hundred seventy-eight".