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# 224 (number)

224 (two hundred [and] twenty-four) is the natural number following 223 and preceding 225.

 ← 223 224 225 →
Cardinal two hundred twenty-four
Ordinal 224th
(two hundred twenty-fourth)
Factorization 25× 7
Prime No
Greek numeral ΣΚΔ´
Roman numeral CCXXIV
Binary 111000002
Ternary 220223
Quaternary 32004
Quinary 13445
Senary 10126
Octal 3408
Duodecimal 16812
Vigesimal B420
Base 36 6836

224 is a practical number,[1] and a sum of two positive cubes 23 + 63.[2]

224 is the smallest k with λ(k) = 24, where λ(k) is the Carmichael function.[3]

## References

1. ^ Sloane, N.J.A. (ed.). "Sequence A005153 (Practical numbers)". The On-Line Encyclopedia of Integer Sequences. OEIS Foundation.
2. ^ Sloane, N.J.A. (ed.). "Sequence A003325 (Numbers that are the sum of 2 positive cubes)". The On-Line Encyclopedia of Integer Sequences. OEIS Foundation.
3. ^ Sloane, N.J.A. (ed.). "Sequence A141162 (Smallest k such that lambda(k) = n)". The On-Line Encyclopedia of Integer Sequences. OEIS Foundation.