636
636 is a composite number, even, a calendar year.
Historical context — 636 AD
Calendar year
Year 636 (DCXXXVI) was a leap year starting on Monday of the Julian calendar.
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Historical context — 636 BC
Calendar year
The year 636 BC was a year of the pre-Julian Roman calendar.
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Year facts
- Year type
-
Leap year
Divisible by 4 and not by 100; February has 29 days.
- Days in year
- 366
- ISO weeks
- 52
- Started on
-
Friday
January 1, 636
- Ended on
-
Saturday
December 31, 636
- Friday the 13ths
-
1
One Friday the 13th this year.
- Decade
-
630s
630–639
- Century
-
7th century
601–700
- Millennium
-
1st millennium
1–1000
- Years ago
-
1,390
1390 years before 2026.
In other calendars
- Hebrew
-
4396 / 4397 AM
Rosh Hashanah falls in September/October.
- Islamic Hijri
-
14 / 15 AH
Lunar calendar; year spans differ from Gregorian.
- Chinese
-
Year of the zodiac:Fire zodiac:Monkey
Sexagenary cycle position 33 of 60. Lunar new year falls in late January / mid-February.
- Buddhist Era
-
1179 BE
Counted from the parinirvana of the Buddha (Theravada / Thai / Sri Lankan convention).
- Persian Solar Hijri
-
14 / 15 SH
Iranian calendar; Nowruz (new year) falls on the spring equinox.
- Ethiopian
-
628 / 629 ET
Year boundary at Enkutatash (September 11/12).
- Indian National (Saka)
-
558 / 557 Saka
Indian national calendar; year starts in March.
Properties
Primality
Prime factorization: 2 2 × 3 × 53
Divisors & multiples
Sums & aliquot sequence
Representations
- In words
- six hundred thirty-six
- Ordinal
- 636th
- Roman numeral
- DCXXXVI
- Binary
- 1001111100
- Octal
- 1174
- Hexadecimal
- 0x27C
- Base64
- Anw=
- One's complement
- 64,899 (16-bit)
Historical numeral systems
- Babylonian (base 60)
- 𒌋 𒌋𒌋𒌋𒁹𒁹𒁹𒁹𒁹𒁹
- Egyptian hieroglyphic
- 𓍢𓍢𓍢𓍢𓍢𓍢𓎆𓎆𓎆𓏺𓏺𓏺𓏺𓏺𓏺
- Greek (Milesian)
- χλϛʹ
- Mayan (base 20)
- 𝋡·𝋫·𝋰
- Chinese
- 六百三十六
- Chinese (financial)
- 陸佰參拾陸
Digit at this position in famous constants
- π — Pi (π)
- Digit 636 = 8
- e — Euler's number (e)
- Digit 636 = 8
- φ — Golden ratio (φ)
- Digit 636 = 3
- √2 — Pythagoras's (√2)
- Digit 636 = 3
- ln 2 — Natural log of 2
- Digit 636 = 7
- γ — Euler-Mascheroni (γ)
- Digit 636 = 2
Also seen as
Goldbach's conjecture says every even integer greater than 2 is the sum of two primes. For 636, here are decompositions:
- 5 + 631 = 636
- 17 + 619 = 636
- 19 + 617 = 636
- 23 + 613 = 636
- 29 + 607 = 636
- 37 + 599 = 636
- 43 + 593 = 636
- 59 + 577 = 636
Showing the first eight; more decompositions exist.
UTF-8 encoding: C9 BC (2 bytes).
TCP/UDP port 636 is the well-known port for LDAPS — LDAP over TLS.
As an unsigned 32-bit integer, this is the IPv4 address 0.0.2.124.
- Address
- 0.0.2.124
- Class
- reserved
- IPv4-mapped IPv6
- ::ffff:0.0.2.124
Unspecified address (0.0.0.0/8) — "this network" placeholder.
The number 636 is an active NANP area code (North American Numbering Plan).
- Primary area
- St. Charles / O'Fallon
- Region
- Missouri
- Country
- United States
Most NANP area codes have multiple overlays in dense regions; the primary area listed is the historic/largest population center for this code.