Number

27

27 is a composite number, odd, a calendar year.

Arithmetic Number Decagonal Deficient Number Evil Number Harshad / Niven Perfect Cube Powerful Number Recamán's Sequence Smith Number Year

Historical context — 27 AD

Calendar year

AD 27 (XXVII) was a common year starting on Wednesday of the Julian calendar.

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

Notable events — 27 BC

Jan 16 The Senate grants Octavian the title "Augustus", marking the founding of the Roman Empire.

Events compiled from Wikipedia ↗ · Licensed CC BY-SA 4.0

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: Friday
January 1, 27
Ended on: Friday
December 31, 27
Friday the 13ths: 1
One Friday the 13th this year.
Decade: 20s
20–29
Century: 1st century
1–100
Millennium: 1st millennium
1–1000
Years ago: 1,999
1999 years before 2026.

In other calendars

Hebrew: 3787 / 3788 AM
Rosh Hashanah falls in September/October.
Chinese: Year of the zodiac:Fire zodiac:Pig
Sexagenary cycle position 24 of 60. Lunar new year falls in late January / mid-February.
Buddhist Era: 570 BE
Counted from the parinirvana of the Buddha (Theravada / Thai / Sri Lankan convention).
Ethiopian: 19 / 20 ET
Year boundary at Enkutatash (September 11/12).
Indian National (Saka): -51 / -52 Saka
Indian national calendar; year starts in March.

Properties

Parity: Odd
Digit count: 2
Digit sum: 9
Digit product: 14
Digital root: 9
Palindrome: No
Bit width: 5 bits
Reversed: 72
Recamán's sequence: a(62) = 27
Square (n²): 729
Cube (n³): 19,683
Cube root (∛n): 3
Divisor count: 4
σ(n) — sum of divisors: 40
φ(n) — Euler's totient: 18
Sum of prime factors: 9

Primality

Prime factorization: 3 ³

Nearest primes: 23 (−4) · 29 (+2)

Divisors & multiples

All divisors (4)

1 · 3 · 9 · 27

Aliquot sum (sum of proper divisors): 13

Factor pairs (a × b = 27)

1 × 27

3 × 9

First multiples

27 · 54 (double) · 81 · 108 · 135 · 162 · 189 · 216 · 243 · 270

Sums & aliquot sequence

As consecutive integers: 13 + 14 8 + 9 + 10 2 + 3 + 4 + 5 + 6 + 7

Aliquot sequence: 27 → 13 → 1 → 0 — terminates at zero

Representations

In words: twenty-seven
Ordinal: 27th
Roman numeral: XXVII
Binary: 11011
Octal: 33
Hexadecimal: 0x1B
Base64: Gw==
One's complement: 228 (8-bit)

In other bases

ternary (3) 1000

quaternary (4) 123

quinary (5) 102

senary (6) 43

septenary (7) 36

nonary (9) 30

undecimal (11) 25

duodecimal (12) 23

tridecimal (13) 21

tetradecimal (14) 1d

pentadecimal (15) 1c

Historical numeral systems

Babylonian (base 60): 𒌋𒌋𒁹𒁹𒁹𒁹𒁹𒁹𒁹
Egyptian hieroglyphic: 𓎆𓎆𓏺𓏺𓏺𓏺𓏺𓏺𓏺
Greek (Milesian): κζʹ
Mayan (base 20): 𝋡·𝋧
Chinese: 二十七
Chinese (financial): 貳拾柒

In other modern scripts

Eastern Arabic ٢٧ Devanagari २७ Bengali ২৭ Tamil ௨௭ Thai ๒๗ Tibetan ༢༧ Khmer ២៧ Lao ໒໗ Burmese ၂၇

Digit at this position in famous constants

π — Pi (π): Digit 27 = 8
e — Euler's number (e): Digit 27 = 7
φ — Golden ratio (φ): Digit 27 = 3
√2 — Pythagoras's (√2): Digit 27 = 2
ln 2 — Natural log of 2: Digit 27 = 2
γ — Euler-Mascheroni (γ): Digit 27 = 9

Also seen as

ASCII character

As an ASCII codepoint, 27 is ESC (escape). ASCII control character.

Hex color

#00001B

RGB(0, 0, 27)

IPv4 address

As an unsigned 32-bit integer, this is the IPv4 address 0.0.0.27.

Address: 0.0.0.27
Class: reserved
IPv4-mapped IPv6: ::ffff:0.0.0.27

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

US numbered highway

Matches numbered highway designation:

I-27 — Lubbock to Amarillo, TX.

Interstate 27 on Wikipedia ↗