81105282720

Names of 81105282720

• Cardinal: 81105282720 can be written as Eighty-one billion, one hundred five million, two hundred eighty-two thousand, seven hundred twenty.

Scientific notation

• Scientific notation: 8.110528272 × 10¹⁰

Factors of 81105282720

• Number of distinct prime factors ω(n): 7
• Total number of prime factors Ω(n): 13
• Sum of prime factors: 10652

Divisors of 81105282720

• Number of divisors d(n): 768
• Complete list of divisors:
  1 2 3 4 5 6 7 8 9 10 11 12 14 15 16 18 20 21 22 23 24 27 28 30 32 33 35 36 40 42 44 45 46 48 54 55 56 60 63 66 69 70 72 77 80 84 88 90 92 96 99 105 108 110 112 115 120 126 132 135 138 140 144 154 160 161 165 168 176 180 184 189 198 207 210 216 220 224 230 231 240 252 253 264 270 276 280 288 297 308 315 322 330 336 345 352 360 368 378 385 396 414 420 432 440 460 462 480 483 495 504 506 528 540 552 560 594 616 621 630 644 660 672 690 693 720 736 756 759 770 792 805 828 840 864 880 920 924 945 966 990 1008 1012 1035 1056 1080 1104 1120 1155 1188 1232 1242 1260 1265 1288 1320 1380 1386 1440 1449 1485 1512 1518 1540 1584 1610 1656 1680 1760 1771 1840 1848 1890 1932 1980 2016 2024 2070 2079 2160 2208 2277 2310 2376 2415 2464 2484 2520 2530 2576 2640 2760 2772 2898 2970 3024 3036 3080 3105 3168 3220 3312 3360 3465 3542 3680 3696 3780 3795 3864 3960 4048 4140 4158 4320 4347 4554 4620 4752 4830 4968 5040 5060 5152 5280 5313 5520 5544 5796 5940 6048 6072 6160 6210 6440 6624 6831 6930 7084 7245 7392 7560 7590 7728 7920 8096 8280 8316 8694 8855 9108 9240 9504 9660 9936 10080 10120 10395 10601 10626 11040 11088 11385 11592 11880 12144 12320 12420 12880 13662 13860 14168 14490 15120 15180 15456 15840 15939 16560 16632 17388 17710 18216 18480 19320 19872 20240 20790 21202 21252 21735 22176 22770 23184 23760 24288 24840 25760 26565 27324 27720 28336 28980 30240 30360 31803 31878 33120 33264 34155 34776 35420 36432 36960 38640 40480 41580 42404 42504 43470 45540 46368 47520 47817 49680 53005 53130 54648 55440 56672 57960 60720 63606 63756 66528 68310 69552 70840 72864 74207 77280 79695 83160 84808 85008 86940 91080 95409 95634 99360 106010 106260 109296 110880 115920 116611 121440 127212 127512 136620 139104 141680 148414 159015 159390 166320 169616 170016 173880 182160 190818 191268 212020 212520 218592 222621 231840 233222 239085 243823 254424 255024 273240 283360 286227 296828 318030 318780 332640 339232 347760 349833 364320 371035 381636 382536 424040 425040 445242 466444 477045 478170 487646 508848 510048 546480 572454 583055 593656 636060 637560 667863 695520 699666 731469 742070 763272 765072 816277 848080 850080 890484 932888 954090 956340 975292 1017696 1049499 1092960 1113105 1144908 1166110 1187312 1219115 1272120 1275120 1335726 1399332 1431135 1462938 1484140 1526544 1530144 1632554 1696160 1706761 1749165 1780968 1865776 1908180 1912680 1950584 2003589 2098998 2194407 2226210 2289816 2332220 2374624 2438230 2448831 2544240 2550240 2671452 2682053 2798664 2862270 2925876 2968280 3053088 3148497 3265108 3339315 3413522 3498330 3561936 3657345 3731552 3816360 3825360 3901168 4007178 4081385 4197996 4388814 4452420 4579632 4664440 4876460 4897662 5088480 5120283 5247495 5342904 5364106 5597328 5724540 5851752 5936560 6296994 6530216 6583221 6678630 6827044 6996660 7123872 7314690 7346493 7632720 7650720 7802336 8014356 8046159 8162770 8395992 8533805 8777628 8904840 9159264 9328880 9752920 9795324 10017945 10240566 10494990 10685808 10728212 10972035 11194656 11449080 11703504 11873120 12244155 12593988 13060432 13166442 13357260 13410265 13654088 13993320 14629380 14692986 15265440 15360849 15742485 16028712 16092318 16325540 16791984 17067610 17555256 17809680 18657760 18774371 19505840 19590648 20035890 20481132 20989980 21371616 21456424 21944070 22039479 22898160 23407008 24138477 24488310 25187976 25601415 26120864 26332884 26714520 26820530 27308176 27986640 29258760 29385972 30721698 31484970 32057424 32184636 32651080 32916105 33583968 34135220 35110512 35619360 36732465 37548742 39011680 39181296 40071780 40230795 40962264 41979960 42912848 43888140 44078958 45796320 46082547 48276954 48976620 50375952 51202830 52665768 53429040 53641060 54616352 55973280 56323113 58517520 58771944 61443396 62969940 64114848 64369272 65302160 65832210 68270440 70221024 72415431 73464930 75097484 76804245 78362592 80143560 80461590 81924528 83959920 85825696 87776280 88157916 92165094 93871855 96553908 97953240 100751904 102405660 105331536 106858080 107282120 110197395 112646226 117035040 117543888 120692385 122886792 125939880 128738544 130604320 131664420 136540880 144830862 146929860 150194968 153608490 160287120 160923180 163849056 167919840 168969339 175552560 176315832 184330188 187743710 193107816 195906480 204811320 210663072 214564240 220394790 225292452 230412735 235087776 241384770 245773584 251879760 257477088 263328840 273081760 281615565 289661724 293859720 300389936 307216980 320574240 321846360 337938678 351105120 352631664 362077155 368660376 375487420 386215632 391812960 409622640 429128480 440789580 450584904 460825470 482769540 491547168 503759520 506908017 526657680 563231130 579323448 587719440 600779872 614433960 643692720 675877356 705263328 724154310 737320752 750974840 772431264 819245280 844846695 881579160 901169808 921650940 965539080 1013816034 1053315360 1126462260 1158646896 1175438880 1228867920 1287385440 1351754712 1448308620 1474641504 1501949680 1689693390 1763158320 1802339616 1843301880 1931078160 2027632068 2252924520 2317293792 2457735840 2534540085 2703509424 2896617240 3003899360 3379386780 3526316640 3686603760 3862156320 4055264136 4505849040 5069080170 5407018848 5793234480 6758773560 7373207520 8110528272 9011698080 10138160340 11586468960 13517547120 16221056544 20276320680 27035094240 40552641360 81105282720
• Sum of all divisors σ(n): 369336360960
• Sum of proper divisors (its aliquot sum) s(n): 288231078240
• 81105282720 is an abundant number, because the sum of its proper divisors (288231078240) is greater than itself. Its abundance is 207125795520

Bases of 81105282720

• Binary: 1001011100010010000000110011010100000₂
• Hexadecimal: 0x12E24066A0
• Base-36: 119BZOO0

Squares and roots of 81105282720

• 81105282720 squared (81105282720²) is 6578066885091130598400
• 81105282720 cubed (81105282720³) is 533515974466385900147674779648000
• The square root of 81105282720 is 284789.8922363643
• The cube root of 81105282720 is 4328.6225160691

Scales and comparisons

• 81,105,282,720 seconds is equal to 2,578 years, 46 weeks, 4 days, 13 hours, 12 minutes.
• To count from 1 to 81,105,282,720 would take you about five thousand, one hundred fifty-seven 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 81105282720 cubic inches would be around 360.7 feet tall.

Recreational maths with 81105282720

• 81105282720 backwards is 02728250118
• 81105282720 is a Harshad number.
• The number of decimal digits it has is: 11
• The sum of 81105282720's digits is 36
• More coming soon!