684646 has 16 divisors (see below), whose sum is σ = 1108800. Its totient is φ = 316008.

The previous prime is 684643. The next prime is 684647. The reversal of 684646 is 646486.

684646 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (684643) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1425 + ... + 1843.

It is an arithmetic number, because the mean of its divisors is an integer number (69300).

2⁶⁸⁴⁶⁴⁶ is an apocalyptic number.

684646 is a deficient number, since it is larger than the sum of its proper divisors (424154).

684646 is a wasteful number, since it uses less digits than its factorization.

684646 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 483.

The product of its digits is 27648, while the sum is 34.

The square root of 684646 is about 827.4333810042. The cubic root of 684646 is about 88.1364103395.

The spelling of 684646 in words is "six hundred eighty-four thousand, six hundred forty-six".