684066 has 16 divisors (see below), whose sum is σ = 1427904. Its totient is φ = 218064.

The previous prime is 684053. The next prime is 684091. The reversal of 684066 is 660486.

It is a happy number.

It is a congruent number.

It is an unprimeable number.

684066 is an untouchable number, because it is not equal to the sum of proper divisors of any number.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2341 + ... + 2616.

It is an arithmetic number, because the mean of its divisors is an integer number (89244).

2⁶⁸⁴⁰⁶⁶ is an apocalyptic number.

684066 is an abundant number, since it is smaller than the sum of its proper divisors (743838).

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

684066 is a wasteful number, since it uses less digits than its factorization.

684066 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4985.

The product of its (nonzero) digits is 6912, while the sum is 30.

The square root of 684066 is about 827.0828253567. The cubic root of 684066 is about 88.1115149629. Note that the first 3 decimals are identical.

The spelling of 684066 in words is "six hundred eighty-four thousand, sixty-six".