The way in which a number like 2070830 could be written will depend on the number.
2070830 is two million seventy thousand eight hundred thirty.
I would write it like this 5,000,000.
you can write it like this: if I wanted to say, ice cream is great with chocolate, with numbers it would look like 1c3 cr34m 1s gr8 w17h ch0c0l8
Just like you write numbers anywhere else. don't use short hand to write thousands. one thousand three hundred, would be a correct way of writing 1300. while thirteen hundred would be the incorrect way to write it.
1,002,000 if in Europe it would look like 1.002.000
Like this: 15,200,000
Like this: 9,000,000
Like this: 251,800,000
Those are two separate numbers. Thus, writing them would look like this: 2 and 1100
it easy 57,000,000 millions have 6 noughts
Like this: 200,000
2,150,888
Uno punto veinte y cinco. They would write 1,25 in numbers, unless they're from countries with a strong English-language influence, where they would write it 1.25 like we would.