Fifty

Fifty (50) is the natural number between 49 and 51 . She is straight .

mathematics

50 is the smallest number that can be represented in two different ways as the sum of two square numbers: 50 = 1 ² + 7 ² = 5 ² + 5 ² .
It can also be represented as the sum of three square numbers (50 = 3 ² + 4 ² + 5 ² ) and four square numbers (50 = 6 ² + 3 ² + 2 ² + 1 ² ).
It is divisible by its checksum and is therefore the 2nd Harshad number .
50 is the fifth even nontotient because the equation φ ( x ) = 50 has no solution.
It is also the fourth straight non-quotient , since the equation x - φ ( x ) = 50 has no solution.
50 is the fourth hexagonal pyramid number .
50 = 1 ² + (1 ² + 2 ² ) + (1 ² + 2 ² + 3 ² ) + (1 ² + 2 ² + 3 ² + 4 ² )
50% are half. Therefore, the term fifty-fifty (50/50) denotes a division into two equal parts.

Pentecost is on the 50th day of Easter .
In the Jewish Kabbalah there are 50 gates of wisdom / understanding and 50 gates of impurity.
In Judaism, every 50th year is a year of remission .
In Genesis , God wants to spare Sodom if Abraham finds 50 righteous people in the city.
The book of Genesis has 50 chapters.

50 km walking is an Olympic discipline, 50 meter running is not.
A long swimming lane is 50 meters long.
In Cricket - One-Day-Internationals the number of overs is limited to 50.
If no piece is captured and no pawn is moved in chess 50 moves, the game ends in a draw ( 50- move rule ).

The United States is made up of 50 states .

In the European Union , Switzerland and many other countries, the maximum speed limit is 50 kilometers per hour in urban areas .

50 is a common number in currency units; in the euro zone, for example, there is the 50 cent coin and the 50 euro note.

Wiktionary: fifty - explanations of meanings, word origins, synonyms, translations

Wikiquote: Fifty Quotes

↑ JM de Koninck: Those fascinating numbers . AMS Bookstore, 2009, p. 18. ISBN 0-8218-4807-0 .
↑ Genesis 18:26