828
828 is a composite number, even, a calendar year.
Historical context — 828 AD
Calendar year
Year 828 (DCCCXXVIII) was a leap year starting on Wednesday of the Julian calendar.
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Historical context — 828 BC
Decade
This article concerns the period 829 BC – 820 BC.
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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
-
Saturday
January 1, 828
- Ended on
-
Sunday
December 31, 828
- Friday the 13ths
-
1
One Friday the 13th this year.
- Decade
-
820s
820–829
- Century
-
9th century
801–900
- Millennium
-
1st millennium
1–1000
- Years ago
-
1,198
1198 years before 2026.
In other calendars
- Hebrew
-
4588 / 4589 AM
Rosh Hashanah falls in September/October.
- Islamic Hijri
-
212 / 213 AH
Lunar calendar; year spans differ from Gregorian.
- Chinese
-
Year of the zodiac:Earth zodiac:Monkey
Sexagenary cycle position 45 of 60. Lunar new year falls in late January / mid-February.
- Buddhist Era
-
1371 BE
Counted from the parinirvana of the Buddha (Theravada / Thai / Sri Lankan convention).
- Persian Solar Hijri
-
206 / 207 SH
Iranian calendar; Nowruz (new year) falls on the spring equinox.
- Ethiopian
-
820 / 821 ET
Year boundary at Enkutatash (September 11/12).
- Indian National (Saka)
-
750 / 749 Saka
Indian national calendar; year starts in March.
Properties
- Parity
- Even
- Digit count
- 3
- Digit sum
- 18
- Digit product
- 128
- Digital root
- 9
- Palindrome
- Yes
- Bit width
- 10 bits
- Recamán's sequence
- a(30,768) = 828
- Square (n²)
- 685,584
- Cube (n³)
- 567,663,552
- Divisor count
- 18
- σ(n) — sum of divisors
- 2,184
- φ(n) — Euler's totient
- 264
- Sum of prime factors
- 33
Primality
Prime factorization: 2 2 × 3 2 × 23
Divisors & multiples
Sums & aliquot sequence
Representations
- In words
- eight hundred twenty-eight
- Ordinal
- 828th
- Roman numeral
- DCCCXXVIII
- Binary
- 1100111100
- Octal
- 1474
- Hexadecimal
- 0x33C
- Base64
- Azw=
- One's complement
- 64,707 (16-bit)
Historical numeral systems
- Babylonian (base 60)
- 𒌋𒁹𒁹𒁹 𒌋𒌋𒌋𒌋𒁹𒁹𒁹𒁹𒁹𒁹𒁹𒁹
- Egyptian hieroglyphic
- 𓍢𓍢𓍢𓍢𓍢𓍢𓍢𓍢𓎆𓎆𓏺𓏺𓏺𓏺𓏺𓏺𓏺𓏺
- Greek (Milesian)
- ωκηʹ
- Mayan (base 20)
- 𝋢·𝋡·𝋨
- Chinese
- 八百二十八
- Chinese (financial)
- 捌佰貳拾捌
Digit at this position in famous constants
- π — Pi (π)
- Digit 828 = 0
- e — Euler's number (e)
- Digit 828 = 0
- φ — Golden ratio (φ)
- Digit 828 = 0
- √2 — Pythagoras's (√2)
- Digit 828 = 9
- ln 2 — Natural log of 2
- Digit 828 = 5
- γ — Euler-Mascheroni (γ)
- Digit 828 = 5
Also seen as
Goldbach's conjecture says every even integer greater than 2 is the sum of two primes. For 828, here are decompositions:
- 5 + 823 = 828
- 7 + 821 = 828
- 17 + 811 = 828
- 19 + 809 = 828
- 31 + 797 = 828
- 41 + 787 = 828
- 59 + 769 = 828
- 67 + 761 = 828
Showing the first eight; more decompositions exist.
UTF-8 encoding: CC BC (2 bytes).
As an unsigned 32-bit integer, this is the IPv4 address 0.0.3.60.
- Address
- 0.0.3.60
- Class
- reserved
- IPv4-mapped IPv6
- ::ffff:0.0.3.60
Unspecified address (0.0.0.0/8) — "this network" placeholder.
The number 828 is an active NANP area code (North American Numbering Plan).
- Primary area
- Asheville
- Region
- North Carolina
- 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.