Eighty

The eighty (80) is the natural number that follows seventy-nine and precedes eighty-one.

Mathematical properties

• It is a composite number, which has the following factors: 1, 2, 4, 5, 8, 10, 16, 20 and 40. As the sum of its factors is 106  80, it is an abundant number.
• It's a Harshad number.

Features

• 80 is the atomic number of mercury.
• 80 is the number of the network port through which all HTTP traffic enters.