Number

50

50 is a composite number, even, a calendar year.

Deficient Number Harshad / Niven Odious Number Pernicious Number Recamán's Sequence Year

Historical context — 50 AD

Calendar year

AD 50 (L) was a common year starting on Thursday of the Julian calendar.

Excerpt from Wikipedia (en) ↗ · Licensed CC BY-SA 4.0 · English fallback Read the full article on Wikipedia →

Historical context — 50 BC

Calendar year

Year 50 BC was a year of the pre-Julian Roman calendar.

Excerpt from Wikipedia (en) ↗ · Licensed CC BY-SA 4.0 · English fallback Read the full article on Wikipedia →

Year facts

Year type: Common year
Standard 365-day year; not divisible by 4 (or divisible by 100 but not 400).
Days in year: 365
ISO weeks: 52
Started on: Saturday
January 1, 50
Ended on: Saturday
December 31, 50
Friday the 13ths: 1
One Friday the 13th this year.
Decade: 50s
50–59
Century: 1st century
1–100
Millennium: 1st millennium
1–1000
Years ago: 1,976
1976 years before 2026.

In other calendars

Hebrew: 3810 / 3811 AM
Rosh Hashanah falls in September/October.
Chinese: Year of the zodiac:Metal zodiac:Dog
Sexagenary cycle position 47 of 60. Lunar new year falls in late January / mid-February.
Buddhist Era: 593 BE
Counted from the parinirvana of the Buddha (Theravada / Thai / Sri Lankan convention).
Ethiopian: 42 / 43 ET
Year boundary at Enkutatash (September 11/12).
Indian National (Saka): -28 / -29 Saka
Indian national calendar; year starts in March.

Cultural significance

Jewish sacred

The Year of Jubilee — every fiftieth year, debts were forgiven and slaves freed.

Leviticus 25.

American significant

Fifty states of the United States; "the big 5-0" milestone birthday.

Sourced from Wikipedia (Numerology, Chinese numerology, Gematria, and per-culture articles).

Properties

Parity: Even
Digit count: 2
Digit sum: 5
Digit product: 0
Digital root: 5
Palindrome: No
Bit width: 6 bits
Reversed: 5
Recamán's sequence: a(216) = 50
Square (n²): 2,500
Cube (n³): 125,000
Divisor count: 6
σ(n) — sum of divisors: 93
φ(n) — Euler's totient: 20
Sum of prime factors: 12

Primality

Prime factorization: 2 × 5 ²

Nearest primes: 47 (−3) · 53 (+3)

Divisors & multiples

All divisors (6)

1 · 2 · 5 · 10 · 25 (half) · 50

Aliquot sum (sum of proper divisors): 43

Factor pairs (a × b = 50)

1 × 50

2 × 25

5 × 10

First multiples

50 · 100 (double) · 150 · 200 · 250 · 300 · 350 · 400 · 450 · 500

Sums & aliquot sequence

As a sum of two squares: 1² + 7² = 5² + 5²

As consecutive integers: 11 + 12 + 13 + 14 8 + 9 + 10 + 11 + 12

Aliquot sequence: 50 → 43 → 1 → 0 — terminates at zero

Representations

In words: fifty
Ordinal: 50th
Roman numeral: L
Binary: 110010
Octal: 62
Hexadecimal: 0x32
Base64: Mg==
One's complement: 205 (8-bit)

In other bases

ternary (3) 1212

quaternary (4) 302

quinary (5) 200

senary (6) 122

septenary (7) 101

nonary (9) 55

undecimal (11) 46

duodecimal (12) 42

tridecimal (13) 3b

tetradecimal (14) 38

pentadecimal (15) 35

Historical numeral systems

Babylonian (base 60): 𒌋𒌋𒌋𒌋𒌋
Egyptian hieroglyphic: 𓎆𓎆𓎆𓎆𓎆
Greek (Milesian): νʹ
Mayan (base 20): 𝋢·𝋪
Chinese: 五十
Chinese (financial): 伍拾

In other modern scripts

Eastern Arabic ٥٠ Devanagari ५० Bengali ৫০ Tamil ௫௦ Thai ๕๐ Tibetan ༥༠ Khmer ៥០ Lao ໕໐ Burmese ၅၀

Digit at this position in famous constants

π — Pi (π): Digit 50 = 1
e — Euler's number (e): Digit 50 = 9
φ — Golden ratio (φ): Digit 50 = 7
√2 — Pythagoras's (√2): Digit 50 = 9
ln 2 — Natural log of 2: Digit 50 = 2
γ — Euler-Mascheroni (γ): Digit 50 = 9

Also seen as

Goldbach decomposition

Goldbach's conjecture says every even integer greater than 2 is the sum of two primes. For 50, here are decompositions:

3 + 47 = 50
7 + 43 = 50
13 + 37 = 50
19 + 31 = 50

ASCII character

As an ASCII codepoint, 50 is 2. Printable ASCII character 2.

Hex color

#000032

RGB(0, 0, 50)

IPv4 address

As an unsigned 32-bit integer, this is the IPv4 address 0.0.0.50.

Address: 0.0.0.50
Class: reserved
IPv4-mapped IPv6: ::ffff:0.0.0.50

Unspecified address (0.0.0.0/8) — "this network" placeholder.

US numbered highway

Matches numbered highway designations:

I-50 — (reserved for future extension).
US 50 — Ocean City, MD to West Sacramento, CA — "the Loneliest Road in America" through Nevada.

Interstate 50 on Wikipedia ↗ US 50 on Wikipedia ↗