The number 67 is already in decimal form. In mathematics, a decimal is a way of expressing a number that is not whole, using a point to separate the whole number part from the fractional part. Since 67 is a whole number, you can also express it as 67.0 to highlight its decimal nature.
To further clarify, any whole number can be converted into a decimal by adding a .0. For example, the whole number 5 is the same as 5.0. Thus, when you ask what 67 is as a decimal, you are effectively referring to the number itself, and it can be denoted as 67.0.