2827
RFC 2827 recommends ingress filtering.
- Odd
- Composite
Where 2827 fits
Why 2827 is special
It is the single measure that would end address spoofing, it was published in 2000, and adoption is still incomplete a quarter of a century later.
2827 is part of
Factors & digit properties
- Divisors (4)
- 1, 11, 257, 2827
- Prime factorisation
- 11 × 257
- Digit sum
- 19
- Digital root
- 1
Representations
- Decimal
- 2827
- Scientific notation
- 2.827 × 10^3
Roman numerals
M M D C C C X X V I I
Binary
1 0 1 1 0 0 0 0 1 0 1 1
1 × 2,048 + 0 × 1,024 + 1 × 512 + 1 × 256 + 0 × 128 + 0 × 64 + 0 × 32 + 0 × 16 + 1 × 8 + 0 × 4 + 1 × 2 + 1 × 1 = 2,827
Octal
5 4 1 3
5 × 512 + 4 × 64 + 1 × 8 + 3 × 1 = 2,827
Hexadecimal
b 0 b
b × 256 + 0 × 16 + b × 1 = 2,827
Read as powers of two: 2,048 + 512 + 256 + 8 + 2 + 1 = 2,827.
In historical numeral systems
Egyptian
2 lotuses, 8 coils of rope, 2 hobbles, 7 strokes
2 × 1,000 + 8 × 100 + 2 × 10 + 7 × 1 = 2,827. The signs are simply repeated and added; where they sit on the line is a matter of layout, not value.
Babylonian
4 corner wedges + 7 vertical wedges (sixties place), 7 vertical wedges (units place)
47 × 60 + 7 = 2827. Places are separated by a space on the tablet, with the higher place written first.
Systems that simply cannot reach this value are left out. Where a script needs a font most readers do not have, the reading is given instead of the glyphs — see number systems for each system in full.
Other mathematical patterns
- Deficient number
- Semiprime
- Lucky number (mathematical sieve)
Related numbers & connections
One recommends filtering traffic with source addresses a network did not allocate; the other makes it work where a network has two providers.
View 3704 →Numbers Around Us
- appears alongside3704
why?
Strength 0.50, confidence "high".
- appears inNumbers that make the internet work
why?
Strength 0.50, confidence "high".
Technology & computing
RFC 2827, also known as BCP 38, recommends that networks filter outbound traffic with source addresses they did not allocate. Incomplete deployment remains the reason spoofed-source attacks are possible.
DocumentedTechnology & computingGeography: International — IETFPeriod: 2000
Common questions
Is 2827 a prime number?
No, 2827 is not prime.
What are the factors of 2827?
The factors of 2827 are 1, 11, 257, 2827.
What is 2827 in Roman numerals?
2827 in Roman numerals is MMDCCCXXVII.
About this page's data
Mathematical facts:computed directly from the number's value — nothing to source or verify externally.
Contextual records: 1 reviewer-confirmed record, sourced and reviewed before publication.
Last reviewed: 15 July 2026