Number
677
- Positive
- Odd
- Prime
- 3 digits
677 is an odd 3-digit integer and a prime number. It has 2 divisors and a digital root of 2.
Number properties
ParityOddnot divisible by 2
SignPositive
PrimalityPrime
Absolute value677
Digit count3
Digit sum20
Digital root2repeated digit sum
PalindromicNoreads differently backwards
Happy numberNosquared-digit sums reach 1
Harshad numberNodivisible by its own digit sum
Factors & divisors
Prime factorisation677
Distinct prime factors1677
Number of divisors2
Sum of divisors σ(n)678
Aliquot sum1sum of the proper divisors
ClassificationDeficientthe aliquot sum is less than the number
Euler's totient φ(n)676integers below n that share no factor with it
SquarefreeYesno repeated prime factor
All divisors1, 6772 in total
Arithmetic
Representations
Decimal677
Binary101010010110 bits
Octal1245
Hexadecimal2A5
Base 36IT
Roman numeralDCLXXVII
In wordssix hundred and seventy-seven
Ordinalsix hundred and seventy-seventh
Scientific notation6.77 × 10^2
Engineering notation677
Nearest landmarks
Powers & multiples
677 to the power 2458,329
677 to the power 3310,288,733
677 to the power 4210,065,472,241
677 to the power 5142,214,324,707,157
First ten multiples677, 1,354, 2,031, 2,708, 3,385, 4,062, 4,739, 5,416, 6,093, 6,770
Powers of twoBetween 2^9 (512) and 2^10 (1,024)
Divisibility tests
Divisible by 2No, remainder 1
Divisible by 3No, remainder 2
Divisible by 4No, remainder 1
Divisible by 5No, remainder 2
Divisible by 6No, remainder 5
Divisible by 7No, remainder 5
Divisible by 8No, remainder 5
Divisible by 9No, remainder 2
Divisible by 10No, remainder 7
Divisible by 11No, remainder 6
Divisible by 12No, remainder 5
Divisible by 100No, remainder 77
Collatz (3n + 1) trajectory
Steps to reach 151the total stopping time
Reaches 1Yesthe Collatz conjecture says every positive integer does, but it is unproven
First steps677 → 2,032 → 1,016 → 508 → 254 → 127 → 382 → 191 → 574 → 287 → …
Last steps… → 5 → 16 → 8 → 4 → 2 → 1
As a percentage & fraction
As a percentage67,700%
677% as a decimal6.77
677% of 100677
677% of 1,0006,770
As a fraction of 100677/100
Read another way
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Derived from 677
Other readings
Also reads as
#667777 (colour)
- #667777
- Grey
- Dark
- Nearest: Dim grey
#667777 is a grey with RGB values 102, 119, 119 and HSL 180°, 8%, 43%. It is a dark colour, so white text on it reaches 4.7:1 contrast (AA for normal text). The nearest named colour is Dim grey.
Colour values
#667777#667777
HEX#667777
HEX (short)#677
RGBrgb(102, 119, 119)
RGB (0–1)0.4, 0.4667, 0.4667
RGB percentages40%, 46.7%, 46.7%
HSLhsl(180, 7.7%, 43.3%)
HSV / HSBhsv(180, 14.3%, 46.7%)
CMYK14.3%, 0%, 0%, 53.3%≈naive device-independent conversion; real print needs an ICC profile
24-bit integer6,715,255
CSS custom property--colour: #667777;
Brightness & contrast
Relative luminance0.1735WCAG 2.x, 0 is black and 1 is white
Perceived brightness114.2 of 255ITU-R BT.601 weighting
Light or darkDark
Best text colour on this backgroundWhitecontrast 4.7:1
Contrast with white4.7:1WCAG normal text: AA
Contrast with black4.47:1WCAG normal text: Fail
Greyscale equivalent#737373
Inverted#998888
Colour vision & accessibility
Distinguishable without hueYesnever rely on hue alone to carry meaning
Contrast with white, large text4.7:1WCAG large text: AAA
Contrast with black, large text4.47:1WCAG large text: AA
Named colours
Hue familygrey
CSS keyword usableNo exact keyword
Colour harmonies
Complementary#776666
Analogous#66776F, #666F77
Triadic#776677, #777766
Split complementary#77666F, #776F66
Tetradic#6F6677, #776666, #6F7766
Tints, shades & saturation
Channel breakdown
R102
G119
B119
Red102 (40%)
Green119 (46.7%)
Blue119 (46.7%)
Hue180°
Saturation (HSL)7.69%
Lightness43.33%
Dominant channelGreen and Blue
Hex per channelR 66 · G 77 · B 77
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Harmonies
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