81929720040

Names of 81929720040

• Cardinal: 81929720040 can be written as Eighty-one billion, nine hundred twenty-nine million, seven hundred twenty thousand and forty.

Scientific notation

• Scientific notation: 8.192972004 × 10¹⁰

Factors of 81929720040

• Number of distinct prime factors ω(n): 7
• Total number of prime factors Ω(n): 9
• Sum of prime factors: 12296

Divisors of 81929720040

• Number of divisors d(n): 256
• Complete list of divisors:
  1 2 3 4 5 6 7 8 10 12 14 15 20 21 24 28 29 30 35 40 42 56 58 60 70 84 87 105 116 120 140 145 168 174 203 210 232 280 281 290 348 406 420 435 562 580 609 696 812 840 843 870 1015 1124 1160 1218 1405 1624 1686 1740 1967 2030 2248 2436 2810 3045 3372 3480 3934 4060 4215 4872 5620 5901 6090 6744 7868 8120 8149 8430 9835 11240 11802 11969 12180 15736 16298 16860 19670 23604 23938 24360 24447 29505 32596 33720 35907 39340 40745 47208 47876 48894 57043 59010 59845 65192 71814 78680 81490 83783 95752 97788 114086 118020 119690 122235 143628 162980 167566 171129 179535 195576 228172 236040 239380 244470 251349 285215 287256 325960 335132 342258 347101 359070 418915 456344 478760 488940 502698 570430 670264 684516 694202 718140 837830 855645 977880 1005396 1041303 1140860 1256745 1369032 1388404 1436280 1675660 1711290 1735505 2010792 2082606 2281720 2429707 2513490 2776808 3351320 3363289 3422580 3471010 4165212 4859414 5026980 5206515 6726578 6845160 6942020 7289121 8330424 9718828 10053960 10089867 10413030 12148535 13453156 13884040 14578242 16816445 19437656 20179734 20826060 23543023 24297070 26906312 29156484 33632890 36445605 40359468 41652120 47086046 48594140 50449335 58312968 67265780 70629069 72891210 80718936 94172092 97188280 97535381 100898670 117715115 134531560 141258138 145782420 188344184 195070762 201797340 235430230 282516276 291564840 292606143 353145345 390141524 403594680 470860460 487676905 565032552 585212286 682747667 706290690 780283048 941720920 975353810 1170424572 1365495334 1412581380 1463030715 1950707620 2048243001 2340849144 2730990668 2825162760 2926061430 3413738335 3901415240 4096486002 5461981336 5852122860 6827476670 8192972004 10241215005 11704245720 13654953340 16385944008 20482430010 27309906680 40964860020 81929720040
• Sum of all divisors σ(n): 291646656000
• Sum of proper divisors (its aliquot sum) s(n): 209716935960
• 81929720040 is an abundant number, because the sum of its proper divisors (209716935960) is greater than itself. Its abundance is 127787215920

Bases of 81929720040

• Binary: 1001100010011011001000101000011101000₂
• Hexadecimal: 0x13136450E8
• Base-36: 11MYU8KO

Squares and roots of 81929720040

• 81929720040 squared (81929720040²) is 6712479025832777601600
• 81929720040 cubed (81929720040³) is 549951527360851396754670656064000
• The square root of 81929720040 is 286233.6808273967
• The cube root of 81929720040 is 4343.2399522053

Scales and comparisons

• 81,929,720,040 seconds is equal to 2,605 years, 5 weeks, 5 days, 15 hours, 34 minutes.
• To count from 1 to 81,929,720,040 would take you about five thousand, two hundred ten 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 81929720040 cubic inches would be around 361.9 feet tall.

Recreational maths with 81929720040

• 81929720040 backwards is 04002792918
• 81929720040 is a Harshad number.
• The number of decimal digits it has is: 11
• The sum of 81929720040's digits is 42
• More coming soon!