684564 has 12 divisors (see below), whose sum is σ = 1597344. Its totient is φ = 228184.

The previous prime is 684559. The next prime is 684569. The reversal of 684564 is 465486.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (684559) and next prime (684569).

It is a tau number, because it is divible by the number of its divisors (12).

It is a congruent number.

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

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 28512 + ... + 28535.

It is an arithmetic number, because the mean of its divisors is an integer number (133112).

2⁶⁸⁴⁵⁶⁴ is an apocalyptic number.

It is an amenable number.

684564 is an abundant number, since it is smaller than the sum of its proper divisors (912780).

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

684564 is a wasteful number, since it uses less digits than its factorization.

684564 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 57054 (or 57052 counting only the distinct ones).

The product of its digits is 23040, while the sum is 33.

The square root of 684564 is about 827.3838287035. The cubic root of 684564 is about 88.1328915019.

The spelling of 684564 in words is "six hundred eighty-four thousand, five hundred sixty-four".