684
+684 is the international calling code for American Samoa.
- Even
- Composite
Where 684 fits
Why 684 is special
American Samoa is a US territory whose people are US nationals but not automatically US citizens — the only place with that status.
Factors & digit properties
- Divisors (18)
- 1, 2, 3, 4, 6, 9, 12, 18, 19, 36, 38, 57, 76, 114, 171, 228, 342, 684
- Prime factorisation
- 2^2 × 3^2 × 19
- Digit sum
- 18
- Digital root
- 9
Representations
- Decimal
- 684
- Binary
- 1010101100
- Octal
- 1254
- Hexadecimal
- 2ac
- Roman numeral
- DCLXXXIV
- Scientific notation
- 6.840 × 10^2
Other mathematical patterns
- Abundant number
- Harshad (Niven) number
Related numbers & connections
American Samoa and Samoa are the two halves of the same archipelago under different sovereignties. American Samoans are US nationals but not automatically US citizens.
View 685 →Other connections
- is associated with685
why?
Strength 0.50, confidence "high".
Geography
+684 reaches American Samoa, whose residents are US nationals rather than citizens by birth, a distinction unique among US territories.
DocumentedGeographyGeography: American Samoa
Common questions
Is 684 a prime number?
No, 684 is not prime.
What are the factors of 684?
The factors of 684 are 1, 2, 3, 4, 6, 9, 12, 18, 19, 36, 38, 57, 76, 114, 171, 228, 342, 684.
What is 684 in Roman numerals?
684 in Roman numerals is DCLXXXIV.
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