681868 has 12 divisors (see below), whose sum is σ = 1301832. Its totient is φ = 309920.

The previous prime is 681841. The next prime is 681883. The reversal of 681868 is 868186.

681868 is nontrivially palindromic in base 15.

681868 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 7705 + ... + 7792.

It is an arithmetic number, because the mean of its divisors is an integer number (108486).

2⁶⁸¹⁸⁶⁸ is an apocalyptic number.

It is an amenable number.

681868 is a deficient number, since it is larger than the sum of its proper divisors (619964).

681868 is a wasteful number, since it uses less digits than its factorization.

681868 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 15512 (or 15510 counting only the distinct ones).

The product of its digits is 18432, while the sum is 37.

The square root of 681868 is about 825.7529897009. The cubic root of 681868 is about 88.0170421539.

It can be divided in two parts, 6818 and 68, that added together give a palindrome (6886).

The spelling of 681868 in words is "six hundred eighty-one thousand, eight hundred sixty-eight".