684804 has 24 divisors (see below), whose sum is σ = 1612800. Its totient is φ = 226144.

The previous prime is 684799. The next prime is 684809. The reversal of 684804 is 408486.

It is an interprime number because it is at equal distance from previous prime (684799) and next prime (684809).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (684809) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1597 + ... + 1979.

It is an arithmetic number, because the mean of its divisors is an integer number (67200).

2⁶⁸⁴⁸⁰⁴ is an apocalyptic number.

It is an amenable number.

684804 is an abundant number, since it is smaller than the sum of its proper divisors (927996).

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

684804 is a wasteful number, since it uses less digits than its factorization.

684804 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 539 (or 537 counting only the distinct ones).

The product of its (nonzero) digits is 6144, while the sum is 30.

The square root of 684804 is about 827.5288514608. The cubic root of 684804 is about 88.1431897466.

The spelling of 684804 in words is "six hundred eighty-four thousand, eight hundred four".