Standard form of a number is how we would regularly see numbers written, such as 123 or 43,238,126. In this case, we can break it down to see what we need.
Millions-3
Hundred Thousands- 0
Ten Thousands- 0
Thousands- 0
Hundreds- 6
Tens-1
Ones-2
Using this reasoning, we can see that this number written in standard form is 3,000,612.