81720149770

Names of 81720149770

• Cardinal: 81720149770 can be written as Eighty-one billion, seven hundred twenty million, one hundred forty-nine thousand, seven hundred seventy.

Scientific notation

• Scientific notation: 8.172014977 × 10¹⁰

Factors of 81720149770

• Number of distinct prime factors ω(n): 7
• Total number of prime factors Ω(n): 7
• Sum of prime factors: 2180

Divisors of 81720149770

• Number of divisors d(n): 128
• Complete list of divisors:
  1 2 5 7 10 14 23 35 46 70 89 115 161 178 230 322 331 445 623 662 805 890 1246 1610 1655 1723 2047 2317 3115 3310 3446 4094 4634 6230 7613 8615 10235 11585 12061 14329 15226 17230 20470 23170 24122 28658 29459 38065 39629 53291 58918 60305 71645 76130 79258 106582 120610 143290 147295 153347 198145 206213 266455 277403 294590 306694 396290 412426 532910 554806 570313 677557 766735 1031065 1073429 1140626 1355114 1387015 1533470 2062130 2146858 2774030 2851565 3387785 3526981 3992191 4742899 5367145 5703130 6775570 7053962 7984382 9485798 10734290 13117199 17634905 19960955 23714495 24688867 26234398 35269810 39921910 47428990 49377734 50757857 65585995 91820393 101515714 123444335 131171990 183640786 246888670 253789285 355304999 459101965 507578570 710609998 918203930 1167430711 1776524995 2334861422 3553049990 5837153555 8172014977 11674307110 16344029954 40860074885 81720149770
• Sum of all divisors σ(n): 178029342720
• Sum of proper divisors (its aliquot sum) s(n): 96309192950
• 81720149770 is an abundant number, because the sum of its proper divisors (96309192950) is greater than itself. Its abundance is 14589043180

Bases of 81720149770

• Binary: 1001100000110111001101000011100001010₂
• Hexadecimal: 0x1306E6870A
• Base-36: 11JI2F4A

Squares and roots of 81720149770

• 81720149770 squared (81720149770²) is 6678182878431231052900
• 81720149770 cubed (81720149770³) is 545742105016849904288462792833000
• The square root of 81720149770 is 285867.3639469885
• The cube root of 81720149770 is 4339.5335594543

Scales and comparisons

• 81,720,149,770 seconds is equal to 2,598 years, 23 weeks, 2 days, 1 hour, 36 minutes, 10 seconds.
• To count from 1 to 81,720,149,770 would take you about five thousand, one hundred ninety-six 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 81720149770 cubic inches would be around 361.6 feet tall.

Recreational maths with 81720149770

• 81720149770 backwards is 07794102718
• 81720149770 is a Harshad number.
• The number of decimal digits it has is: 11
• The sum of 81720149770's digits is 46
• More coming soon!