68691 has 8 divisors (see below), whose sum is σ = 104704. Its totient is φ = 39240.

The previous prime is 68687. The next prime is 68699. The reversal of 68691 is 19686.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 68691 - 2² = 68687 is a prime.

It is a Duffinian number.

68691 is a lucky number.

It is not an unprimeable number, because it can be changed into a prime (68699) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1615 + ... + 1656.

It is an arithmetic number, because the mean of its divisors is an integer number (13088).

2⁶⁸⁶⁹¹ is an apocalyptic number.

68691 is a deficient number, since it is larger than the sum of its proper divisors (36013).

68691 is a wasteful number, since it uses less digits than its factorization.

68691 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3281.

The product of its digits is 2592, while the sum is 30.

The square root of 68691 is about 262.0896793084. The cubic root of 68691 is about 40.9543413992.

It can be divided in two parts, 686 and 91, that multiplied together give a palindrome (62426).

The spelling of 68691 in words is "sixty-eight thousand, six hundred ninety-one".