According to Marshall University, Greer scored 1,377 points and hauled in 765 rebounds.
"I'm terribly saddened by the news of Hal's passing", said Marshall Director of Athletics Mike Hamrick in a release. All four were later inducted into the Naismith Memorial Basketball Hall of Fame.
He was the first African-American to play at a state university in West Virginia.
"Hal was a fantastic ambassador for Marshall and a great basketball player", Marshall men's basketball head coach Dan D'Antoni said.
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Nicknamed "the Bulldog" by teammates for his game-face scowl, Mr. Greer played in 1,122 games before retiring in 1973, setting an National Basketball Association record for longevity that has since been surpassed by Robert Parish and 57 others.
Greer is considered one of the greatest Sixers of all time and led the team to the 1967 championship.
The 76ers went on to dethrone their nemesis the Boston Celtics in the Eastern Conference finals, amid shouts of "Boston is dead!" from a crowd of 13,007 Philadelphia fans who witnessed a 140-116 victory in the series-clinching game.
We extend our deepest condolences and send our love, thoughts and prayers to the Greer family during this hard time.
Greer was drafted by Syracuse with the 14th overall pick in 1958 NBA draft and played five seasons with the Nationals before joining the Sixers.
Greer was the first player to have his number retired by the 76ers when the team retired his No. 15 in 1976.
Greer made 10 straight All-Star games and earned All-Star Game MVP honors in 1968.
The Huntington, W.Va. Despite never having an All-NBA first-team selection, native is broadly thought of as the next best guard of their 1960s behind Jerry West and Oscar Robertson.
The Sixers will honor Greer before their playoff game against the Miami Heat on Monday night.
Greer spent his entire NBA career with the 76ers, winning one NBA Championship and appearing in 10 All-Star Games in 15 seasons.
"Greer was the first player to have his number retired by the 76ers organization when the team retired his No. 15 in 1976".