81728100

Names of 81728100

• Cardinal: 81728100 can be written as Eighty-one million, seven hundred twenty-eight thousand, one hundred.

Scientific notation

• Scientific notation: 8.17281 × 10⁷

Factors of 81728100

• Number of distinct prime factors ω(n): 5
• Total number of prime factors Ω(n): 8
• Sum of prime factors: 1360

Divisors of 81728100

• Number of divisors d(n): 108
• Complete list of divisors:
  1 2 3 4 5 6 9 10 12 15 18 20 25 30 36 45 50 60 71 75 90 100 142 150 180 213 225 284 300 355 426 450 639 710 852 900 1065 1278 1279 1420 1775 2130 2556 2558 3195 3550 3837 4260 5116 5325 6390 6395 7100 7674 10650 11511 12780 12790 15348 15975 19185 21300 23022 25580 31950 31975 38370 46044 57555 63900 63950 76740 90809 95925 115110 127900 181618 191850 230220 272427 287775 363236 383700 454045 544854 575550 817281 908090 1089708 1151100 1362135 1634562 1816180 2270225 2724270 3269124 4086405 4540450 5448540 6810675 8172810 9080900 13621350 16345620 20432025 27242700 40864050 81728100
• Sum of all divisors σ(n): 259983360
• Sum of proper divisors (its aliquot sum) s(n): 178255260
• 81728100 is an abundant number, because the sum of its proper divisors (178255260) is greater than itself. Its abundance is 96527160

Bases of 81728100

• Binary: 100110111110001001001100100₂
• Hexadecimal: 0x4DF1264
• Base-36: 1CNPT0

Squares and roots of 81728100

• 81728100 squared (81728100²) is 6679482329610000
• 81728100 cubed (81728100³) is 545901399782599041000000
• The square root of 81728100 is 9040.3595061259
• The cube root of 81728100 is 433.9674280241

Scales and comparisons

• 81,728,100 seconds is equal to 2 years, 31 weeks, 22 hours, 15 minutes.
• To count from 1 to 81,728,100 would take you about three years!

  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 81728100 cubic inches would be around 36.2 feet tall.

Recreational maths with 81728100

• 81728100 backwards is 00182718
• The number of decimal digits it has is: 8
• The sum of 81728100's digits is 27
• More coming soon!