It would be 0.000 070 (zero and 7 millionths)
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eight hundred fifty billion,seventy million,one hundred sixty two.
.070
Depending on the convention you use, that would be: 3,000,070 or 3 000 070 or 3.00007 x 106 (scientific notation)
In today's terms 402,070 = (CDII)LXX in Roman numerals
You write 8.8 million as 8,800,000