• 98 can be written using four 4's:
98 is nontrivially palindromic in base 5, base 6 and base 13.
98 is an esthetic number in base 5 and base 10, because in such bases its adjacent digits differ by 1.
It is an ABA number since it can be written as A⋅BA, here for A=2, B=7.
It is a magnanimous number.
It is an alternating number because its digits alternate between odd and even.
It is a Duffinian number.
98 is an undulating number in base 5 and base 6.
It is a Curzon number.
98 is a nontrivial repdigit in base 13.
It is a plaindrome in base 9, base 11, base 13 and base 15.
It is a nialpdrome in base 7, base 10, base 12, base 13, base 14 and base 16.
It is a zygodrome in base 13.
98 is a wasteful number, since it uses less digits than its factorization.
98 is an odious number, because the sum of its binary digits is odd.
The square root of 98 is about 9.8994949366. The cubic root of 98 is about 4.6104362921.
Subtracting from 98 its sum of digits (17), we obtain a 4-th power (81 = 34).
Multiplying 98 by its product of digits (72), we get a square (7056 = 842).