72 (number)

Soixante-douze redirects here. This article is relating to number 72. For the year, to see 72.

72 ( soixante-douze or septante-deux ) is the Entier naturalness which follows 71 and which precedes 73.

In mathematics

Soixante-douze is the sum of four consecutive prime numbers (13 + 17 + 19 + 23) and also of six consecutive prime numbers (5 + 7 + 11 + 13 + 17 + 19). 72 is a Nombre Harshad and a oblong Nombre or pronic.

In a Euclidean Geometry, each angle interior of a equilateral Pentagone measures 72 degrees.

There are 17 solutions with the equation $\backslash \; varphi\; (X)\; =\; 72\; \backslash ,$ ($\backslash \; varphi\; \backslash ,$ being the Indicatrice of Euler), more than for any integer smaller than 72, which makes a highly indicating Nombre of it.

In other fields

Soixante-douze is also:

• the Atomic number of the Hafnium, a Metal of transition.

• the n° of the French Department, the the Sarthe.
• the number of hours in three Jour S and three Nuit S.
• the full number of books in the Bible Catholique, if one regards the book of the lamentations as belonging to the book of Jérémie .
• the designation of the Soviet Tank T-72.
• historical Years: -72, 72 or 1972.

Zh-yue: 72

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