We know that if sum of digits of a number is divisible by 9, then the number is divisible by 9.
Here, for the given number to be divisible by 9
4 + 8 + 6 + * + 7 = multiple of 9
x + 25 = 0, 9, 18, ….(multiple of 9)
Hence,
x + 25 = 27 [ lowest multiple then]x = 2
∴ x = 2
∴ the least value of x is 2