To write 237 as a mixed number, we can express it as a whole number and a fraction. In this case, 237 is already a whole number, and we can represent it as:
\[ 237 = 237 \frac{0}{1} \]
However, since there is no fractional part, we can simply state that 237 as a mixed number is:
237 (it can be represented as a mixed number with a fractional part of 0, but it is not usually necessary to express whole numbers in this way).