convert 680000kb in mb

Assuming you meant

• the capacity 680,000 Kilobytes and Megabyte, the SI-multiple (see prefix mega-) of the unit byte for digital information storage or transmission and is equal to 10 bytes

Did you mean?

• the capacity 680,000 kibibytes and The megabyte, the multiple of the unit byte for digital information storage or transmission with two different values depending on context: bytes generally for computer memory; and one million bytes generally for computer storage