84
84 is the atomic number of polonium, discovered in 1898 by Marie and Pierre Curie and named after Marie Curie's native Poland.
- Even
- Composite
Where 84 fits
Why 84 is special
84's element carries real history: polonium was the first chemical element ever named to highlight a political cause.
Same number, different meanings
How 84 is understood across different contexts — never implying one meaning because of another.
- Mathematics
84's element carries real history: polonium was the first chemical element ever named to highlight a political cause.
- Science
84 is the atomic number of polonium.
- History
Polonium was discovered in 1898 by Marie and Pierre Curie, who named it after Marie Curie's native Poland — the first element named to highlight a political cause.
Factors & digit properties
- Divisors (12)
- 1, 2, 3, 4, 6, 7, 12, 14, 21, 28, 42, 84
- Prime factorisation
- 2^2 × 3 × 7
- Digit sum
- 12
- Digital root
- 3
Representations
- Decimal
- 84
- Binary
- 1010100
- Octal
- 124
- Hexadecimal
- 54
- Roman numeral
- LXXXIV
- Scientific notation
- 8.400 × 10^1
Other mathematical patterns
- Abundant number
- Harshad (Niven) number
Related numbers & connections
42 is a factor of 84 (42 × 2 = 84).
View 42 →Mathematically related
- has factor42
why?
Strength 0.50, confidence "high".
Science
84 is the atomic number of polonium.
DocumentedScience
History
Polonium was discovered in 1898 by Marie and Pierre Curie, who named it after Marie Curie's native Poland — the first element named to highlight a political cause.
DocumentedHistoryPeriod: 1898
Common questions
Is 84 a prime number?
No, 84 is not prime.
What are the factors of 84?
The factors of 84 are 1, 2, 3, 4, 6, 7, 12, 14, 21, 28, 42, 84.
What is 84 in Roman numerals?
84 in Roman numerals is LXXXIV.
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