684868 has 12 divisors (see below), whose sum is σ = 1208592. Its totient is φ = 339560.

The previous prime is 684857. The next prime is 684869. The reversal of 684868 is 868486.

It is a happy number.

It is a self number, because there is not a number n which added to its sum of digits gives 684868.

It is not an unprimeable number, because it can be changed into a prime (684869) by changing a digit.

684868 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, 130 + ... + 1177.

It is an arithmetic number, because the mean of its divisors is an integer number (100716).

2⁶⁸⁴⁸⁶⁸ is an apocalyptic number.

It is an amenable number.

684868 is a deficient number, since it is larger than the sum of its proper divisors (523724).

684868 is a wasteful number, since it uses less digits than its factorization.

684868 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1442 (or 1440 counting only the distinct ones).

The product of its digits is 73728, while the sum is 40.

The square root of 684868 is about 827.5675199040. The cubic root of 684868 is about 88.1459355387.

The spelling of 684868 in words is "six hundred eighty-four thousand, eight hundred sixty-eight".