We know that if sum of digits of a number is divisible by 9, then the number is divisible by 9.

Here,

4 + 8 + 6 + * + 7 = multiple of 9

* + 25 = 0, 9, 18, ….

Hence,

x + 25 = 27

∴ x = 2

∴ the least value of x is 2