681326 has 16 divisors (see below), whose sum is σ = 1121040. Its totient is φ = 309120.

The previous prime is 681311. The next prime is 681337. The reversal of 681326 is 623186.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 681295 and 681304.

It is a congruent number.

It is an unprimeable number.

681326 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 (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 641 + ... + 1331.

It is an arithmetic number, because the mean of its divisors is an integer number (70065).

2⁶⁸¹³²⁶ is an apocalyptic number.

681326 is a deficient number, since it is larger than the sum of its proper divisors (439714).

681326 is a wasteful number, since it uses less digits than its factorization.

681326 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 739.

The product of its digits is 1728, while the sum is 26.

The square root of 681326 is about 825.4247391495. The cubic root of 681326 is about 87.9937151159.

The spelling of 681326 in words is "six hundred eighty-one thousand, three hundred twenty-six".