681066 has 24 divisors (see below), whose sum is σ = 1491204. Its totient is φ = 224640.

The previous prime is 681061. The next prime is 681067. The reversal of 681066 is 660186.

681066 is nontrivially palindromic in base 16.

It can be written as a sum of positive squares in 2 ways, for example, as 680625 + 441 = 825^2 + 21^2 .

It is not an unprimeable number, because it can be changed into a prime (681061) by changing a digit.

681066 is an untouchable number, because it is not equal to the sum of proper divisors of any number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 2706 + ... + 2946.

2⁶⁸¹⁰⁶⁶ is an apocalyptic number.

681066 is an abundant number, since it is smaller than the sum of its proper divisors (810138).

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

681066 is a wasteful number, since it uses less digits than its factorization.

681066 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 406 (or 403 counting only the distinct ones).

The product of its (nonzero) digits is 1728, while the sum is 27.

The square root of 681066 is about 825.2672294475. The cubic root of 681066 is about 87.9825206330.

The spelling of 681066 in words is "six hundred eighty-one thousand, sixty-six".