684808 has 8 divisors (see below), whose sum is σ = 1284030. Its totient is φ = 342400.

The previous prime is 684799. The next prime is 684809. The reversal of 684808 is 808486.

It can be written as a sum of positive squares in only one way, i.e., 605284 + 79524 = 778^2 + 282^2 .

It is a tau number, because it is divible by the number of its divisors (8).

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 as a sum of consecutive naturals, namely, 42793 + ... + 42808.

2⁶⁸⁴⁸⁰⁸ is an apocalyptic number.

It is an amenable number.

684808 is a deficient number, since it is larger than the sum of its proper divisors (599222).

684808 is a wasteful number, since it uses less digits than its factorization.

684808 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 85607 (or 85603 counting only the distinct ones).

The product of its (nonzero) digits is 12288, while the sum is 34.

The square root of 684808 is about 827.5312682914. The cubic root of 684808 is about 88.1433613636.

The spelling of 684808 in words is "six hundred eighty-four thousand, eight hundred eight".