An infinite number.
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A decimal is not a measurement unit, it is a way in which numbers - pure numbers - are represented.
There are infinitely many real numbers between 6 and 7 and each of them can be represented by a decimal number. One, for example, is 6.00000000000000000000102
Any amount of numbers can be in a decimal.
The maximum value represented in a 32-bit unsigned word is 232-1 = 4,294,967,295, so you can represent all numbers with 9 decimal places and some numbers with 10 decimal places in 32-bits. log(232-1) = 9.632959861 is the true answer.
The number 170 as a decimal is simply 170.0. In decimal form, whole numbers are represented with a decimal point and a zero in the tenths place. This is to indicate that the number is a whole number and does not have any fractional parts.