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
- Scientific notation
- 6.770 × 10^2
Roman numerals
D C L X X V I I
Binary
1 0 1 0 1 0 0 1 0 1
1 × 512 + 0 × 256 + 1 × 128 + 0 × 64 + 1 × 32 + 0 × 16 + 0 × 8 + 1 × 4 + 0 × 2 + 1 × 1 = 677
Octal
1 2 4 5
1 × 512 + 2 × 64 + 4 × 8 + 5 × 1 = 677
Hexadecimal
2 a 5
2 × 256 + a × 16 + 5 × 1 = 677
Read as powers of two: 512 + 128 + 32 + 4 + 1 = 677.
In historical numeral systems
Egyptian
6 coils of rope, 7 hobbles, 7 strokes
6 × 100 + 7 × 10 + 7 × 1 = 677. The signs are simply repeated and added; where they sit on the line is a matter of layout, not value.
Babylonian
1 corner wedge + 1 vertical wedge (sixties place), 1 corner wedge + 7 vertical wedges (units place)
11 × 60 + 17 = 677. Places are separated by a space on the tablet, with the higher place written first.
Greek (Ionic)
chi, then omicron, then zeta, marked as a numeral
chi-omicron-zeta + keraia
chi + omicron + zeta written in descending order and added — the letters carry their values wherever they stand, so this is addition, not place value.
Hebrew numerals
tav, then resh, then ayin, then zayin
tav-resh-ayin-zayin
tav (400) + resh (200) + ayin (70) + zayin (7) = 677, written in descending order.
Systems that simply cannot reach this value are left out. Where a script needs a font most readers do not have, the reading is given instead of the glyphs — see number systems for each system in full.
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: 15 July 2026