إثنان مليون وسبعتمائة
You would write it as... 603,527,490
0.00507 is 507 hundred thousandths.
It is six hundred and eighteen thousandths!
Six hundred-thousandths. Could be easily confused with 0.600: six hundred thousandths. (as in "six" "hundred-thousandths" vs "six hundred" "thousandths")
6.00021 The first decimal place is tenths, then hundredths, thousandths, ten-thousandths, hundred-thousandths, etc. 21 hundred-thousandths must end in the hundred-thousandths place.
200.005 is two hundred and five thousandths.
If it is grouped as "seven (hundred thousandths)", the answer is 0.00007. If it is "(seven hundred) thousandths", it's 0.7.
79 hundred-thousandths = 0.00079
Five hundred thousandths
Six and two hundred thousandths
7 hundred thousandths is a number. It "does" nothing, and nothing "does" it.
If it is grouped as "seven (hundred thousandths)", the answer is 0.00007. If it is "(seven hundred) thousandths", it's 0.7.