284
284 is the partner of 220 in the smallest amicable pair.
- Even
- Composite
Where 284 fits
Why 284 is special
Its proper divisors sum to 220, whose divisors sum back to 284. No further pair was found for over a thousand years after these two, until Fermat and Descartes each produced one in the seventeenth century.
Factors & digit properties
- Divisors (6)
- 1, 2, 4, 71, 142, 284
- Prime factorisation
- 2^2 × 71
- Digit sum
- 14
- Digital root
- 5
Representations
- Decimal
- 284
- Binary
- 100011100
- Octal
- 434
- Hexadecimal
- 11c
- Roman numeral
- CCLXXXIV
- Scientific notation
- 2.840 × 10^2
Other mathematical patterns
- Deficient number
Related numbers & connections
The smallest amicable pair: each number's proper divisors sum to the other. Known to the Pythagoreans and unmatched by any second pair for over a thousand years.
View 220 →Shares a distinctive class
- is associated with220
why?
Strength 0.50, confidence "high".
Mathematics
284's divisors sum to 220, completing the pair. No further amicable pair was found for more than a thousand years after these two were known, until Fermat and Descartes each produced one in the seventeenth century.
DocumentedMathematics
Common questions
Is 284 a prime number?
No, 284 is not prime.
What are the factors of 284?
The factors of 284 are 1, 2, 4, 71, 142, 284.
What is 284 in Roman numerals?
284 in Roman numerals is CCLXXXIV.
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: 3 August 2026