If it is the most common item then:

MODE(A1:A36533)

will do it

Mike

" wrote:

I'm using this formula to sum how many times a unique order number
appears in column A:
=SUM(IF(FREQUENCY(A1:A36533,A1:A36533)=N,1))

where N is the number of times it appears.

There is one order that appears six times and I need to find out what
that order number is. Any suggestions?