104 (number)

104 is a primitive semiperfect number[1] and a composite number, with its divisors being 1, 2, 4, 8, 13, 26, 52 and 104. As it has 8 divisors total, and 8 is one of those divisors, 104 is a refactorable number. The distinct prime factors of 104 add up to 15, and so do the ones of 105, hence the two numbers form a Ruth-Aaron pair under the first definition.

In regular geometry, 104 is the smallest number of unit line segments that can exist in a plane with four of them touching at every vertex.

A figure made up of a row of 4 adjacent congruent rectangles is divided into 104 regions upon drawing diagonals of all possible rectangles.[2]

φ(104) = φ(σ(104)).[3]

• The atomic number of rutherfordium.
• Number of degrees Fahrenheit corresponding to 40 Celsius.

104 is also:

• The number of Corinthian columns in the Temple of Olympian Zeus, the largest temple ever built in Greece.
• The number of guns on Admiral Horatio Nelson's flagship HMS Victory.
• The number of keys on a standard Windows keyboard.
• The number of Symphonies written by Joseph Haydn upon which numbers are agreed (though in fact, he wrote more: see list of symphonies by Joseph Haydn).
• Cent Quatre, an arts centre in Paris.

• List of highways numbered 104
• UFC 104

• Wells, D. The Penguin Dictionary of Curious and Interesting Numbers London: Penguin Group. (1987): 133