81641881728

Names of 81641881728

• Cardinal: 81641881728 can be written as Eighty-one billion, six hundred forty-one million, eight hundred eighty-one thousand, seven hundred twenty-eight.

Scientific notation

• Scientific notation: 8.1641881728 × 10¹⁰

Factors of 81641881728

• Number of distinct prime factors ω(n): 7
• Total number of prime factors Ω(n): 14
• Sum of prime factors: 262

Divisors of 81641881728

• Number of divisors d(n): 768
• Complete list of divisors:
  1 2 3 4 6 8 9 11 12 16 18 22 24 31 32 33 36 37 41 44 48 62 64 66 72 74 82 88 93 96 99 111 123 124 128 132 137 144 148 164 176 186 192 198 222 246 248 264 274 279 288 296 328 333 341 352 369 372 384 396 407 411 444 451 492 496 528 548 558 576 592 656 666 682 704 738 744 792 814 822 888 902 984 992 1023 1056 1096 1116 1147 1152 1184 1221 1233 1271 1312 1332 1353 1364 1408 1476 1488 1507 1517 1584 1628 1644 1776 1804 1968 1984 2046 2112 2192 2232 2294 2368 2442 2466 2542 2624 2664 2706 2728 2952 2976 3014 3034 3069 3168 3256 3288 3441 3552 3608 3663 3813 3936 3968 4059 4092 4224 4247 4384 4464 4521 4551 4588 4736 4884 4932 5069 5084 5248 5328 5412 5456 5617 5904 5952 6028 6068 6138 6336 6512 6576 6882 7104 7216 7326 7626 7872 8118 8184 8494 8768 8928 9042 9102 9176 9768 9864 10138 10168 10323 10656 10824 10912 11234 11439 11808 11904 12056 12136 12276 12617 12672 12741 13024 13152 13563 13653 13764 13981 14208 14432 14652 15207 15252 15744 16236 16368 16687 16851 16988 17536 17856 18084 18204 18352 19536 19728 20276 20336 20646 21312 21648 21824 22468 22878 23616 24112 24272 24552 25234 25482 26048 26304 27126 27306 27528 27962 28864 29304 30414 30504 32472 32736 33374 33702 33976 35712 36168 36408 36704 37851 38223 39072 39456 40552 40672 41292 41943 42624 43296 43648 44936 45621 45756 46717 47027 47232 48224 48544 49104 50061 50468 50553 50964 52096 52608 54252 54612 55056 55759 55924 57728 58608 60828 61008 61787 64944 65472 66748 67404 67952 72336 72816 73408 75702 76446 78144 78912 81104 81344 82584 83886 86592 89872 91242 91512 93434 94054 96448 97088 98208 100122 100936 101106 101928 108504 109224 110112 111518 111848 113553 117216 121656 122016 123574 125829 129888 130944 133496 134808 135904 140151 141081 144672 145632 146816 150183 151404 152892 156288 157139 157824 162208 162688 165168 167277 167772 173184 174127 179744 182484 183024 185361 186868 188108 192896 194176 196416 200244 201872 202212 203856 207829 217008 218448 220224 223036 223696 227106 234432 243312 244032 247148 251658 259776 266992 269616 271808 280302 282162 289344 291264 300366 302808 305784 314278 324416 330336 334554 335544 348254 359488 364968 366048 370722 373736 376216 392832 400488 403744 404424 407712 415658 420453 423243 434016 436896 440448 446072 447392 454212 468864 471417 486624 488064 494296 501831 503316 517297 519552 522381 533984 539232 543616 556083 560604 564324 578688 582528 600732 605616 611568 623487 628556 648832 660672 669108 671088 696508 718976 729936 732096 741444 747472 752432 800976 807488 808848 815424 831316 840906 846486 868032 873792 892144 894784 908424 942834 973248 988592 1003662 1006632 1034594 1044762 1067968 1078464 1112166 1121208 1128648 1201464 1211232 1223136 1246974 1257112 1321344 1338216 1342176 1393016 1414251 1459872 1464192 1482888 1494944 1504864 1551891 1567143 1601952 1614976 1617696 1630848 1662632 1681812 1692972 1728529 1736064 1747584 1784288 1789568 1816848 1870461 1885668 1915397 1946496 1977184 2007324 2013264 2069188 2089524 2135936 2156928 2224332 2242416 2257296 2286119 2402928 2422464 2446272 2493948 2514224 2676432 2684352 2786032 2828502 2919744 2965776 2989888 3009728 3103782 3134286 3203904 3235392 3325264 3363624 3385944 3457058 3568576 3633696 3740922 3771336 3830794 3954368 4014648 4026528 4138376 4179048 4448664 4484832 4514592 4572238 4655673 4805856 4844928 4892544 4987896 5028448 5185587 5352864 5368704 5572064 5657004 5746191 5839488 5931552 5979776 6019456 6207564 6268572 6407808 6442699 6470784 6650528 6727248 6771888 6858357 6914116 7137152 7267392 7481844 7542672 7661588 7908736 8029296 8053056 8276752 8358096 8897328 8969664 9029184 9144476 9311346 9611712 9975792 10056896 10371174 10705728 11144128 11314008 11492382 11863104 12415128 12537144 12885398 13301056 13454496 13543776 13716714 13828232 14534784 14963688 15085344 15323176 15556761 16058592 16106112 16553504 16716192 17238573 17794656 17939328 18058368 18288952 18622692 19223424 19328097 19951584 20113792 20575071 20742348 21411456 22288256 22628016 22984764 23726208 24830256 25074288 25770796 26602112 26908992 27087552 27433428 27656464 29927376 30170688 30646352 31113522 32117184 33107008 33432384 34477146 35589312 36577904 37245384 38656194 39903168 41150142 41484696 45256032 45969528 49660512 50148576 51541592 53817984 54175104 54866856 55312928 57984291 59854752 60341376 61292704 62227044 64234368 66214016 66864768 68954292 70869689 71178624 73155808 74490768 77312388 79806336 82300284 82969392 90512064 91939056 99321024 100297152 103083184 109733712 110625856 115968582 119709504 122585408 124454088 137908584 141739378 146311616 148981536 154624776 164600568 165938784 181024128 183878112 198642048 200594304 206166368 212609067 219467424 221251712 231937164 239419008 245170816 248908176 275817168 283478756 292623232 297963072 309249552 329201136 331877568 367756224 412332736 425218134 438934848 463874328 497816352 551634336 566957512 595926144 618499104 637827201 658402272 663755136 735512448 824665472 850436268 877869696 927748656 995632704 1103268672 1133915024 1236998208 1275654402 1316804544 1700872536 1855497312 1991265408 2206537344 2267830048 2473996416 2551308804 2633609088 3401745072 3710994624 4535660096 5102617608 6803490144 7421989248 9071320192 10205235216 13606980288 20410470432 27213960576 40820940864 81641881728
• Sum of all divisors σ(n): 280366894080
• Sum of proper divisors (its aliquot sum) s(n): 198725012352
• 81641881728 is an abundant number, because the sum of its proper divisors (198725012352) is greater than itself. Its abundance is 117083130624

Bases of 81641881728

• Binary: 1001100000010001111000100000010000000₂
• Hexadecimal: 0x13023C4080
• Base-36: 11I7GV40

Squares and roots of 81641881728

• 81641881728 squared (81641881728²) is 6665396852088740265984
• 81641881728 cubed (81641881728³) is 544175541468412442555976989540352
• The square root of 81641881728 is 285730.4354247199
• The cube root of 81641881728 is 4338.1477107721

Scales and comparisons

• 81,641,881,728 seconds is equal to 2,595 years, 49 weeks, 6 days, 4 hours, 28 minutes, 48 seconds.
• To count from 1 to 81,641,881,728 would take you about five thousand, one hundred ninety-one 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 81641881728 cubic inches would be around 361.5 feet tall.

Recreational maths with 81641881728

• 81641881728 backwards is 82718814618
• The number of decimal digits it has is: 11
• The sum of 81641881728's digits is 54
• More coming soon!