840 using four significant figures is 840.0
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78,200seventy-eight thousand, two hundred
Eight hundred thousand, three hundred six.
Eight hundred million twelve hundred in number form is 800,001,200
The number 9,223,372,036,854,775,808 can be expressed in words as "nine quintillion, two hundred twenty-three quadrillion, three hundred seventy-two trillion, thirty-six billion, eight hundred fifty-four million, seven hundred seventy-five thousand, eight hundred eight."
Eight hundred fifty-one thousandths