50 (number)

"Fifty" redirects here. For other uses, see 50.

50 (fifty) is the natural number following 49 and preceding 51.

← 49 50 51 →
← 50 51 52 53 54 55 56 57 58 59 → List of numbers Integers ← 0 10 20 30 40 50 60 70 80 90 →
Cardinal	fifty
Ordinal	50th (fiftieth)
Numeral system	quinquagesimal
Factorization	2 × 52
Divisors	1, 2, 5, 10, 25, 50z
Greek numeral	Ν´
Roman numeral	L, l
Unicode symbol(s)	ↆ
Binary	1100102
Ternary	12123
Senary	1226
Octal	628
Duodecimal	4212
Hexadecimal	3216
Armenian	Ծ
Hebrew	נ / ן
Babylonian numeral	𒐐
Egyptian hieroglyph	𓎊

In mathematics

50 as the sum of two non-zero squares

Fifty is the smallest number that is the sum of two non-zero square numbers in two distinct ways.^[1] 50 is a Stirling number of the first kind and a Narayana number.

In science

• The fifth magic number in nuclear physics

In religion

• The traditional number of years in a jubilee period.^[2]
• The Solemnity of Pentecost is celebrated fifty days from and including Easter Sunday. The Greek word pentekoste means fiftieth, hence the name.
• The fifty Hail Mary during the meditation of the mysteries of the life of Jesus and the Virgin Mary of the Holy Rosary
• In Hindu tantric tradition, the number 50 holds significance as the 50 Rudras in the Malinīvijayottara correlate with the 50 phonemes of Sanskrit, as well as with the 50 severed heads worn around goddess Kali's head. The mantra Aham ("I am"), as laid out in the Vijñāna Bhairava represents the first अ(a) and last ह(ha) phonemes of the Sanskrit alphabet and is believed to represent ultimate reality, in accordance with its non-dual philosophy.

In other fields

• The percentage (50%) equivalent to one half, so that the phrase "fifty-fifty" commonly expresses something divided equally in two; in business this is often denoted as being the ultimate in equal partnership
• In years of marriage, the gold or "golden" wedding anniversary