It's about the number of Members of Parliament (The U.K.).
In other words, the count of Members of Parliament (The U.K.) is 1 times 640.(a.k.a. MPs) (2016 figures) (formally "Members of the House of Commons of the Parliament of the United Kingdom of Great Britain and Northern Ireland")
There are 650 Members of Parliament in the U.K. The Commons Chamber in the Palace of Westminster only has seating for 427 members, so those arriving late to House debates must stay standing.
It's about nine-tenths the number of Inductees in the Rock and Roll Hall of Fame.
In other words, 640 is 0.8540 times the count of Inductees in the Rock and Roll Hall of Fame, and the count of Inductees in the Rock and Roll Hall of Fame is 1.170 times that amount.(November, 2015 figures) (including individuals and groups)
It's about one-and-one-fifth times the number of Stores in the Mall of America.
In other words, the count of Stores in the Mall of America is 0.830 times 640.(a.k.a. MOA, a.k.a. MoA, a.k.a. Megamall) (Bloomington, Minnesota) (2015 figures) (approximate)
It's about four-fifths the number of Kernels on an Ear of Corn.
In other words, the count of Kernels on an Ear of Corn is 1 times 640.(Corn, a.k.a. Maize; Kernel a.k.a. Seed) (average) (for Dent Corn, a.k.a. field corn)
It's about three-fourths the number of Population of Vatican City.
In other words, the count of Population of Vatican City is 1.320 times 640.(a.k.a. Vatican City State, a.k.a. Stato della Città del Vaticano, a.k.a. Status Civitatis Vaticanae) (Rome, Italy) (2014 estimates; permanent residents only)
It's about one-and-one-third times the number of Olympic Gold Medals Won by the Soviet Union.
In other words, the count of Olympic Gold Medals Won by the Soviet Union is 0.7410 times 640.(a.k.a. Union of Soviet Socialist Republics, a.k.a. USSR, a.k.a. Сою́з Сове́тских Социалисти́ческих Респу́блик, a.k.a. CCCP) (a.k.a. Olympic Games, a.k.a. Jeux olympiques) (Summer and Winter Games grand totals; excluding Russian Federation Medals) (1952 thru 1988 figures)
It's about one-and-four-fifths times the number of Sesame Seeds on a Big Mac bun.
In other words, the count of Sesame Seeds on a Big Mac bun is 0.560 times 640.(McDonald's sandwich; approximate figures)