Number
168
- Positive
- Even
- Composite
- 3 digits
168 is an even 3-digit integer and a composite number. It has 16 divisors and a digital root of 6.
The canonical address for this page is /168.
Number properties
ParityEvendivisible by 2
SignPositive
PrimalityComposite
Absolute value168
Digit count3
Digit sum15
Digital root6repeated digit sum
PalindromicNoreads differently backwards
Happy numberNosquared-digit sums reach 1
Harshad numberNodivisible by its own digit sum
Factors & divisors
Prime factorisation2^3 × 3 × 7
Distinct prime factors32, 3, 7
Number of divisors16
Sum of divisors σ(n)480
Aliquot sum312sum of the proper divisors
ClassificationAbundantthe aliquot sum exceeds the number
Euler's totient φ(n)48integers below n that share no factor with it
SquarefreeNohas a repeated prime factor
All divisors1, 2, 3, 4, 6, 7, 8, 12, 14, 21, 24, 28, 42, 56, 84, 16816 in total
Arithmetic
Representations
Decimal168
Binary101010008 bits
Octal250
HexadecimalA8
Base 364O
Roman numeralCLXVIII
In wordsone hundred and sixty-eight
Ordinalone hundred and sixty-eighth
Scientific notation1.68 × 10^2
Engineering notation168
Nearest landmarks
Powers & multiples
168 to the power 228,224
168 to the power 34,741,632
168 to the power 4796,594,176
168 to the power 5133,827,821,568
First ten multiples168, 336, 504, 672, 840, 1,008, 1,176, 1,344, 1,512, 1,680
Powers of twoBetween 2^7 (128) and 2^8 (256)
Divisibility tests
Divisible by 2Yes
Divisible by 3Yes
Divisible by 4Yes
Divisible by 5No, remainder 3
Divisible by 6Yes
Divisible by 7Yes
Divisible by 8Yes
Divisible by 9No, remainder 6
Divisible by 10No, remainder 8
Divisible by 11No, remainder 3
Divisible by 12Yes
Divisible by 100No, remainder 68
Collatz (3n + 1) trajectory
Steps to reach 110the total stopping time
Highest value reached168
Reaches 1Yesthe Collatz conjecture says every positive integer does, but it is unproven
First steps168 → 84 → 42 → 21 → 64 → 32 → 16 → 8 → 4 → 2 → …
Last steps… → 32 → 16 → 8 → 4 → 2 → 1
As a percentage & fraction
As a percentage16,800%
168% as a decimal1.68
168% of 100168
168% of 1,0001,680
As a fraction of 100168/100
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Derived from 168
Other readings
Also reads as
#000168 (colour)
- #000168
- Blue
- Dark
- Nearest: Navy
#000168 is a blue with RGB values 0, 1, 104 and HSL 239°, 100%, 20%. It is a dark colour, so white text on it reaches 17.4:1 contrast (AAA for normal text). The nearest named colour is Navy.
Colour values
#000168#000168
HEX#000168
RGBrgb(0, 1, 104)
RGB (0–1)0, 0.0039, 0.4078
RGB percentages0%, 0.4%, 40.8%
HSLhsl(239.4, 100%, 20.4%)
HSV / HSBhsv(239.4, 100%, 40.8%)
CMYK100%, 99%, 0%, 59.2%≈naive device-independent conversion; real print needs an ICC profile
24-bit integer360
CSS custom property--colour: #000168;
Brightness & contrast
Relative luminance0.01021WCAG 2.x, 0 is black and 1 is white
Perceived brightness35.1 of 255ITU-R BT.601 weighting
Light or darkDark
Best text colour on this backgroundWhitecontrast 17.44:1
Contrast with white17.44:1WCAG normal text: AAA
Contrast with black1.2:1WCAG normal text: Fail
Greyscale equivalent#080808
Inverted#FFFE97
Colour vision & accessibility
Distinguishable without hueShifts in lightness toonever rely on hue alone to carry meaning
Contrast with white, large text17.44:1WCAG large text: AAA
Contrast with black, large text1.2:1WCAG large text: Fail
Named colours
Hue familyblue
CSS keyword usableNo exact keyword
Colour harmonies
Complementary#686700
Analogous#003568, #330068
Triadic#680001, #016800
Split complementary#683300, #356800
Tetradic#680035, #686700, #006833
Tints, shades & saturation
Channel breakdown
R0
G1
B104
Red0 (0%)
Green1 (0.4%)
Blue104 (40.8%)
Hue239.42°
Saturation (HSL)100%
Lightness20.39%
Dominant channelBlue
Hex per channelR 00 · G 01 · B 68
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