• 104 can be written using four 4's:
104 is nontrivially palindromic in base 5, base 6 and base 12.
104 is an esthetic number in base 14, because in such base its adjacent digits differ by 1.
It is a tau number, because it is divible by the number of its divisors (8).
104 is an admirable number.
104 is an undulating number in base 5 and base 6.
104 is a nontrivial repdigit in base 12.
It is a plaindrome in base 9, base 12, base 15 and base 16.
It is a nialpdrome in base 11, base 12, base 13 and base 14.
It is a zygodrome in base 12.
It is an amenable number.
104 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.
It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.
104 is a wasteful number, since it uses less digits than its factorization.
104 is an odious number, because the sum of its binary digits is odd.
The square root of 104 is about 10.1980390272. The cubic root of 104 is about 4.7026693754.
Adding to 104 its reverse (401), we get a palindrome (505).