224
+224 is the international calling code for Guinea.
- Even
- Composite
Where 224 fits
Why 224 is special
Guinea holds a large share of the world's bauxite, the ore aluminium is made from, so much of the world's aluminium begins here.
Same number, different meanings
How 224 is understood across different contexts — never implying one meaning because of another.
- Mathematics
Guinea holds a large share of the world's bauxite, the ore aluminium is made from, so much of the world's aluminium begins here.
- Science
Establishing Andromeda's distance in 1925 proved that spiral nebulae are separate galaxies. Until then it was genuinely open whether the Milky Way was the whole universe.
- Geography
+224 reaches Guinea, which holds among the largest bauxite reserves on Earth. Aluminium production anywhere traces back to a small number of countries, and this is one of them.
Factors & digit properties
- Divisors (12)
- 1, 2, 4, 7, 8, 14, 16, 28, 32, 56, 112, 224
- Prime factorisation
- 2^5 × 7
- Digit sum
- 8
- Digital root
- 8
Representations
- Decimal
- 224
- Scientific notation
- 2.240 × 10^2
Roman numerals
C C X X I V
CCXXIV uses the subtractive pair IV: one before five — five minus one.
Binary
1 1 1 0 0 0 0 0
1 × 128 + 1 × 64 + 1 × 32 + 0 × 16 + 0 × 8 + 0 × 4 + 0 × 2 + 0 × 1 = 224
Octal
3 4 0
3 × 64 + 4 × 8 + 0 × 1 = 224
Hexadecimal
e 0
e × 16 + 0 × 1 = 224
Read as powers of two: 128 + 64 + 32 = 224.
In historical numeral systems
Egyptian
2 coils of rope, 2 hobbles, 4 strokes
2 × 100 + 2 × 10 + 4 × 1 = 224. The signs are simply repeated and added; where they sit on the line is a matter of layout, not value.
Babylonian
3 vertical wedges (sixties place), 4 corner wedges + 4 vertical wedges (units place)
3 × 60 + 44 = 224. Places are separated by a space on the tablet, with the higher place written first.
Greek (Ionic)
sigma, then kappa, then delta, marked as a numeral
sigma-kappa-delta + keraia
sigma + kappa + delta 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 kaf, then dalet
resh-kaf-dalet
resh (200) + kaf (20) + dalet (4) = 224, written in descending order.
Maya
2 bars + 1 dot (upper, twenties place) over 4 dots (lower, units place)
11 × 20 + 4 = 224. 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
- Abundant number
- Harshad (Niven) number
Related numbers & connections
Guinea and Guinea-Bissau are two of the three West African states carrying Guinea in the name, distinguished in practice by their codes and former colonisers.
View 245 →The Whirlpool's spiral arms were drawn in 1845 and Andromeda's distance measured in 1925. Eighty years separate seeing spiral structure from understanding what it was.
View 5194 →Science
Establishing Andromeda's distance in 1925 proved that spiral nebulae are separate galaxies. Until then it was genuinely open whether the Milky Way was the whole universe.
DocumentedSciencePeriod: 1925
Geography
+224 reaches Guinea, which holds among the largest bauxite reserves on Earth. Aluminium production anywhere traces back to a small number of countries, and this is one of them.
DocumentedGeographyGeography: Guinea
Common questions
Is 224 a prime number?
No, 224 is not prime.
What are the factors of 224?
The factors of 224 are 1, 2, 4, 7, 8, 14, 16, 28, 32, 56, 112, 224.
What is 224 in Roman numerals?
224 in Roman numerals is CCXXIV. IV is subtractive: one before five — five minus one. Written additively it would be CCXXIIII, which Roman inscriptions used freely — the strict subtractive form is a later convention.
About this page's data
Mathematical facts:computed directly from the number's value — nothing to source or verify externally.
Contextual records: 2 reviewer-confirmed records, sourced and reviewed before publication.
Last reviewed: 15 July 2026