Hecho general: 172 is the rank of Iceland in world population.
Hecho matemático: 172 is a repdigit in base 6 (444).
Trivia: 172 is the record in miles per hour of John White's shot in squash.
Fecha histórica: June 20th is the day in 1963 that the so-called "red telephone" is established between the Soviet Union and the United States following the Cuban Missile Crisis.