684568 has 8 divisors (see below), whose sum is σ = 1283580. Its totient is φ = 342280.

The previous prime is 684559. The next prime is 684569. The reversal of 684568 is 865486.

684568 is nontrivially palindromic in base 15.

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

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (684569) by changing a digit.

684568 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, 42778 + ... + 42793.

2⁶⁸⁴⁵⁶⁸ is an apocalyptic number.

It is an amenable number.

684568 is a deficient number, since it is larger than the sum of its proper divisors (599012).

684568 is a wasteful number, since it uses less digits than its factorization.

684568 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 85577 (or 85573 counting only the distinct ones).

The product of its digits is 46080, while the sum is 37.

The square root of 684568 is about 827.3862459577. The cubic root of 684568 is about 88.1330631591.

The spelling of 684568 in words is "six hundred eighty-four thousand, five hundred sixty-eight".