Replace the question mark with the correct number in the below-given picture?

Can you think of a smallest +ve number such that if we shuffle the digits of the number, the new number becomes double the original number?

What makes this number unique: 8,549,176,320?

What is the next number in this matchsticks series riddle?

On my way to St. Ives I saw a man with 7 wives. Each wife had 7 sacks. Each sack had 7 cats. Each cat had 7 kittens. Kittens, cats, sacks, wives. How many were going to St. Ives?

Before Mount Everest was discovered, what was the highest mountain in the world?

A number can be multiplied by multiple of nine
i.e 9 18 27 36 45 ...

and the resulting number consist of only one digit.

Can you identify the number ?

I go up and I go down.
I go up towards the beautiful sky and down toward the green ground.
I am present tense.
I am past tense too
Children love me.

Who Am I?

I always drive my customer away.

Who am I?

Solve this riddle by finding the odd one out from the rest.