68689 has 4 divisors (see below), whose sum is σ = 69300. Its totient is φ = 68080.

The previous prime is 68687. The next prime is 68699. The reversal of 68689 is 98686.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It can be written as a sum of positive squares in 2 ways, for example, as 14400 + 54289 = 120^2 + 233^2 .

It is a cyclic number.

It is not a de Polignac number, because 68689 - 2¹ = 68687 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (68683) 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, 82 + ... + 379.

It is an arithmetic number, because the mean of its divisors is an integer number (17325).

2⁶⁸⁶⁸⁹ is an apocalyptic number.

It is an amenable number.

68689 is a deficient number, since it is larger than the sum of its proper divisors (611).

68689 is a wasteful number, since it uses less digits than its factorization.

68689 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 610.

The product of its digits is 20736, while the sum is 37.

The square root of 68689 is about 262.0858637928. The cubic root of 68689 is about 40.9539439212.

It can be divided in two parts, 68 and 689, that added together give a palindrome (757).

The spelling of 68689 in words is "sixty-eight thousand, six hundred eighty-nine".