• 86 can be written using four 4's:
• Sorting the digits of 286 in ascending order we obtain a prime of 26 digits.
It is a happy number.
86 is nontrivially palindromic in base 6.
86 is an esthetic number in base 5 and base 16, because in such bases its adjacent digits differ by 1.
It is a semiprime because it is the product of two primes.
It is a Curzon number.
86 is a nontrivial repdigit in base 6.
It is a plaindrome in base 4, base 6, base 8, base 11, base 13, base 15 and base 16.
It is a nialpdrome in base 5, base 6, base 10, base 12 and base 14.
It is a zygodrome in base 6.
It is a self number, because there is not a number n which added to its sum of digits gives 86.
It is a congruent number.
86 is a wasteful number, since it uses less digits than its factorization.
It is an anagram of its base 13 representation: 86 = (68)13.
86 is an evil number, because the sum of its binary digits is even.
The sum of its prime factors is 45.
The square root of 86 is about 9.2736184955. The cubic root of 86 is about 4.4140049624.
Adding to 86 its sum of digits (14), we get a square (100 = 102).