681368 has 16 divisors (see below), whose sum is σ = 1302480. Its totient is φ = 334048.

The previous prime is 681367. The next prime is 681371. The reversal of 681368 is 863186.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (681361) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 380 + ... + 1227.

It is an arithmetic number, because the mean of its divisors is an integer number (81405).

2⁶⁸¹³⁶⁸ is an apocalyptic number.

It is an amenable number.

681368 is a deficient number, since it is larger than the sum of its proper divisors (621112).

681368 is a wasteful number, since it uses less digits than its factorization.

681368 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1666 (or 1662 counting only the distinct ones).

The product of its digits is 6912, while the sum is 32.

The square root of 681368 is about 825.4501802047. The cubic root of 681368 is about 87.9955231882.

The spelling of 681368 in words is "six hundred eighty-one thousand, three hundred sixty-eight".