Here, our given number is x806, which is divisible by 9.

We know that if number is divisible by 9 only when sum of digits of given number is divisible by 9.

Hence, if x806 is divisible by 9, then,

X + 8 + 0 + 6 = 0, 9, 18,…

∴ 14 + x = multiple of 9.

Hence, x = (multiple of 9) – 14

Here, possible values for multiples of 9 is 18

Hence, x = 4

∴ Possible number is 4806.