million = 10^6
Billion = 10^9 (i.e. 10 to the ninth power) (for Americans; not Brits!)
Trillion = 10^12
Quadrillion = 10^15
Quintillion = 10^18
Sextillion = 10^21
Septillion = 10^24
Octillion = 10^27
Nonillion = 10^30
Decillion = 10^33
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2.51 million written in number form is 2,510,000
1.7 million IS a whole number.
There are no periods/decimals in the number one million. There are 6 zeros following the number 1. Thus, 1 million is 1,000,000
As a number it is: 250,000 = a quarter of a million
As a number it is: 57,800,000 = 57.8 million