Bluebulb Projects' The Measure of Things presents:
680 is about four-fifths the number of Population of Vatican City.
In other words, it's 0.8080 times the count of Population of Vatican City, and the count of Population of Vatican City is 1.240 times that amount.
(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)