677
+677 is the international calling code for Solomon Islands.
- Odd
- Prime
Where 677 fits
Why 677 is special
The Solomon Islands were the site of the Guadalcanal campaign, and unexploded ordnance from the Second World War is still cleared there.
677 is part of
Factors & digit properties
- Divisors (2)
- 1, 677
- Prime factorisation
- 677
- Digit sum
- 20
- Digital root
- 2
Representations
- Decimal
- 677
- Binary
- 1010100101
- Octal
- 1245
- Hexadecimal
- 2a5
- Roman numeral
- DCLXXVII
- Scientific notation
- 6.770 × 10^2
Other mathematical patterns
- Deficient number
Related numbers & connections
The Solomon Islands and Vanuatu are Melanesian neighbours. Vanuatu is repeatedly ranked the country most exposed to natural disasters.
View 678 →Nearby in a sequence
- is adjacent to678
why?
Strength 0.50, confidence "high".
Geography
+677 reaches the Solomon Islands, where wartime ordnance from 1942–43 is still being cleared eight decades later.
DocumentedGeographyGeography: Solomon Islands
Common questions
Is 677 a prime number?
Yes, 677 is prime — it has exactly two positive divisors: 1 and itself.
What are the factors of 677?
The factors of 677 are 1, 677.
What is 677 in Roman numerals?
677 in Roman numerals is DCLXXVII.
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