Add me to myself, multiply me by 4, divide me by 8, and you'll have me once more. What am I?

... any number right ?

You're basically multiplying a number by 2, then by 4, and dividing it by 8.

The number one.

Any number

2

Its definitely "2". Because, (2+2=4x4=16/8=2). Hope i got it. Looking forward to congratulate your reward. @alex55