How many men did Lee surrender?

I assume this question is referring to the surrender of Confederate General Robert E. Lee after the Battle of Appomatox Court House. While not the absolute final battle of the American Civil War, this was the last time Robert E. Lee and the Army of Northern Virginia fought, on April 9th, 1865. Recognizing that he would never be able to break through the Union army, which was more vast and heavily armed than he had thought, Lee surrendered his 28,000 troops to Ulysses S. Grant, the Union Army General.
It is one of the much-told stories of the American Civil War that this surrender occurred in a parlor belonging to Wilmer McLean, who said "the war began in my front yard and ended in my front parlor." The First Battle of Bull Run, in 1861, had broken out on McLean's farm, and now the Union and Confederate army generals were signing the surrender in his parlor. This, while coincidental, seems to represent the cyclical nature of the war: at the end, the armies had simply come full circle. Little had been achieved and much had been lost, for which reason reports state that there was little celebration among the Union army at the surrender—little victory had really been won for the American people.
https://www.history.com/this-day-in-history/robert-e-lee-surrenders