1928
1928 is the year penicillin was discovered.
- Even
- Composite
Where 1928 fits
Why 1928 is special
Fleming noticed mould killing bacteria on a contaminated plate and published, but could not produce the drug in useful quantity. It took Florey and Chain's work a decade later to make it a medicine, and all three shared the Nobel Prize.
Factors & digit properties
- Divisors (8)
- 1, 2, 4, 8, 241, 482, 964, 1928
- Prime factorisation
- 2^3 × 241
- Digit sum
- 20
- Digital root
- 2
Representations
- Decimal
- 1928
- Binary
- 11110001000
- Octal
- 3610
- Hexadecimal
- 788
- Roman numeral
- MCMXXVIII
- Scientific notation
- 1.928 × 10^3
Other mathematical patterns
- Deficient number
Related numbers & connections
Penicillin and the double helix — two discoveries where the initial observation and the work that made it useful were separated by years and by different people.
View 1953 →Lind ran a controlled trial in 1747 and the navy took forty years to act; Fleming observed penicillin in 1928 and it took a decade and different people to make it a medicine. Evidence and adoption are separate problems.
View 1747 →Science
Fleming observed mould killing bacteria on a contaminated plate in 1928 and could not produce the substance in quantity. Florey and Chain's work a decade later turned it into a medicine, and all three shared the Nobel Prize.
DocumentedSciencePeriod: 1928
Common questions
Is 1928 a prime number?
No, 1928 is not prime.
What are the factors of 1928?
The factors of 1928 are 1, 2, 4, 8, 241, 482, 964, 1928.
What is 1928 in Roman numerals?
1928 in Roman numerals is MCMXXVIII.
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