81000

Names of 81000

• Cardinal: 81000 can be written as Eighty-one thousand.

Scientific notation

• Scientific notation: 8.1 × 10⁴

Factors of 81000

• Number of distinct prime factors ω(n): 3
• Total number of prime factors Ω(n): 10
• Sum of prime factors: 10

Divisors of 81000

• Number of divisors d(n): 80
• Complete list of divisors:
  1 2 3 4 5 6 8 9 10 12 15 18 20 24 25 27 30 36 40 45 50 54 60 72 75 81 90 100 108 120 125 135 150 162 180 200 216 225 250 270 300 324 360 375 405 450 500 540 600 648 675 750 810 900 1000 1080 1125 1350 1500 1620 1800 2025 2250 2700 3000 3240 3375 4050 4500 5400 6750 8100 9000 10125 13500 16200 20250 27000 40500 81000
• Sum of all divisors σ(n): 283140
• Sum of proper divisors (its aliquot sum) s(n): 202140
• 81000 is an abundant number, because the sum of its proper divisors (202140) is greater than itself. Its abundance is 121140

Bases of 81000

• Binary: 10011110001101000₂
• Hexadecimal: 0x13C68
• Base-36: 1QI0

Squares and roots of 81000

• 81000 squared (81000²) is 6561000000
• 81000 cubed (81000³) is 531441000000000
• The square root of 81000 is 284.6049894151
• The cube root of 81000 is 43.2674871093

Scales and comparisons

• 81,000 seconds is equal to 22 hours, 30 minutes.
• To count from 1 to 81,000 would take you about twenty-two hours.

  This is a very rough estimate, based on a speaking rate of half a second every third order of magnitude. If you speak quickly, you could probably say any randomly-chosen number between one and a thousand in around half a second. Very big numbers obviously take longer to say, so we add half a second for every extra x1000. (We do not count involuntary pauses, bathroom breaks or the necessity of sleep in our calculation!)

• A cube with a volume of 81000 cubic inches would be around 3.6 feet tall.

Recreational maths with 81000

• 81000 backwards is 00018
• 81000 is a Harshad number.
• The number of decimal digits it has is: 5
• The sum of 81000's digits is 9
• More coming soon!