The Number 80
Prime Factors of 80=2x2x2x2x5.
80 can be Partitioned 41 times with each term no larger than 2.
80 can be Partitioned 574 times with each term no larger than 3.
80 is an Abundant Number.
The Chemical Element Mercury has an atomic number of 80.
The Year 80 AD
In the year 80 AD the Emperor Titus inaugurates the Flavian Amphitheatre with 100 days of games.
In the year 80 AD the original Roman Pantheon was destroyed in a fire, together with many other buildings.
In the year 80 AD the Eifel Aqueduct was constructed.
In the year 80 AD the aeolipile, the first steam engine, was invented by Hero of Alexandria.
In the year 80 AD Vologases II of Parthia died.
In the year 80 AD Julius Agricola, the Roman Governor of Britain,advanced into Scotland at the head of a Roman Army.