68645 has 4 divisors (see below), whose sum is σ = 82380. Its totient is φ = 54912.

The previous prime is 68639. The next prime is 68659. The reversal of 68645 is 54686.

It is a Cunningham number, because it is equal to 262²+1.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 24964 + 43681 = 158^2 + 209^2 .

It is a cyclic number.

It is not a de Polignac number, because 68645 - 2⁶ = 68581 is a prime.

It is a d-powerful number, because it can be written as 6⁴ + 8³ + 6⁴ + 4⁸ + 5 .

It is a congruent number.

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, 6860 + ... + 6869.

It is an arithmetic number, because the mean of its divisors is an integer number (20595).

2⁶⁸⁶⁴⁵ is an apocalyptic number.

It is an amenable number.

68645 is a deficient number, since it is larger than the sum of its proper divisors (13735).

68645 is a wasteful number, since it uses less digits than its factorization.

68645 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13734.

The product of its digits is 5760, while the sum is 29.

The square root of 68645 is about 262.0019083900. The cubic root of 68645 is about 40.9451974532.

The spelling of 68645 in words is "sixty-eight thousand, six hundred forty-five".