287
CWE-287 is improper authentication.
- Odd
- Composite
Where 287 fits
Why 287 is special
It is the parent category for everything from accepting an empty password to trusting a token nobody verified, which is why it appears so often in advisories.
Factors & digit properties
- Divisors (4)
- 1, 7, 41, 287
- Prime factorisation
- 7 × 41
- Digit sum
- 17
- Digital root
- 8
Representations
- Decimal
- 287
- Scientific notation
- 2.870 × 10^2
Roman numerals
C C L X X X V I I
Binary
1 0 0 0 1 1 1 1 1
1 × 256 + 0 × 128 + 0 × 64 + 0 × 32 + 1 × 16 + 1 × 8 + 1 × 4 + 1 × 2 + 1 × 1 = 287
Octal
4 3 7
4 × 64 + 3 × 8 + 7 × 1 = 287
Hexadecimal
1 1 f
1 × 256 + 1 × 16 + f × 1 = 287
Read as powers of two: 256 + 16 + 8 + 4 + 2 + 1 = 287.
In historical numeral systems
Egyptian
2 coils of rope, 8 hobbles, 7 strokes
2 × 100 + 8 × 10 + 7 × 1 = 287. The signs are simply repeated and added; where they sit on the line is a matter of layout, not value.
Babylonian
4 vertical wedges (sixties place), 4 corner wedges + 7 vertical wedges (units place)
4 × 60 + 47 = 287. Places are separated by a space on the tablet, with the higher place written first.
Greek (Ionic)
sigma, then pi, then zeta, marked as a numeral
sigma-pi-zeta + keraia
sigma + pi + zeta written in descending order and added — the letters carry their values wherever they stand, so this is addition, not place value.
Hebrew numerals
resh, then pe, then zayin
resh-pe-zayin
resh (200) + pe (80) + zayin (7) = 287, written in descending order.
Maya
2 bars + 4 dots (upper, twenties place) over 1 bar + 2 dots (lower, units place)
14 × 20 + 7 = 287. Places stack vertically with the smallest at the bottom, so the upper group is worth twenty times the lower.
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
- Pentagonal number
- Semiprime
Related numbers & connections
Entity authentication mechanisms are the standardised answer to the weakness class of improper authentication.
View 9798 →Technology & computing
CWE-287 covers software that does not correctly prove a claimed identity. Several more specific weaknesses, including missing authentication and improper credential handling, sit beneath it.
DocumentedTechnology & computingGeography: International — MITRE CWEPeriod: 2006–
Common questions
Is 287 a prime number?
No, 287 is not prime.
What are the factors of 287?
The factors of 287 are 1, 7, 41, 287.
What is 287 in Roman numerals?
287 in Roman numerals is CCLXXXVII.
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