You want to keep the digits that aren't zero and have only one digit on the left side of the decimal. This means this is the first number you will have: 5.74
Now you need to multiply by 10 to the power of ____ To know what the blank is you need to know how many decimal places you are moving. In this case you have moved six decimal places and when you go back you are moving six decimal places in a positive direction. So your answer is:
5.74 x 10^6
