684606 has 32 divisors (see below), whose sum is σ = 1507968. Its totient is φ = 205920.

The previous prime is 684599. The next prime is 684617. The reversal of 684606 is 606486.

It is a happy number.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 5161 + ... + 5291.

It is an arithmetic number, because the mean of its divisors is an integer number (47124).

2⁶⁸⁴⁶⁰⁶ is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 684606, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (753984).

684606 is an abundant number, since it is smaller than the sum of its proper divisors (823362).

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

684606 is a wasteful number, since it uses less digits than its factorization.

684606 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 216.

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

The square root of 684606 is about 827.4092095209. The cubic root of 684606 is about 88.1346938685.

The spelling of 684606 in words is "six hundred eighty-four thousand, six hundred six".