684368 has 10 divisors (see below), whose sum is σ = 1325994. Its totient is φ = 342176.

The previous prime is 684349. The next prime is 684373. The reversal of 684368 is 863486.

It can be written as a sum of positive squares in only one way, i.e., 446224 + 238144 = 668^2 + 488^2 .

It is a congruent number.

It is an unprimeable number.

684368 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 as a sum of consecutive naturals, namely, 21371 + ... + 21402.

2⁶⁸⁴³⁶⁸ is an apocalyptic number.

It is an amenable number.

684368 is a deficient number, since it is larger than the sum of its proper divisors (641626).

684368 is a wasteful number, since it uses less digits than its factorization.

684368 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 42781 (or 42775 counting only the distinct ones).

The product of its digits is 27648, while the sum is 35.

The square root of 684368 is about 827.2653745927. The cubic root of 684368 is about 88.1244794832.

The spelling of 684368 in words is "six hundred eighty-four thousand, three hundred sixty-eight".