81391028004

Names of 81391028004

• Cardinal: 81391028004 can be written as Eighty-one billion, three hundred ninety-one million, twenty-eight thousand and four.

Scientific notation

• Scientific notation: 8.1391028004 × 10¹⁰

Factors of 81391028004

• Number of distinct prime factors ω(n): 6
• Total number of prime factors Ω(n): 12
• Sum of prime factors: 71

Divisors of 81391028004

• Number of divisors d(n): 648
• Complete list of divisors:
  1 2 3 4 6 9 11 12 13 18 19 22 23 26 33 36 38 39 44 46 52 57 66 69 76 78 92 99 114 117 121 132 138 143 156 169 171 198 207 209 228 234 242 247 253 276 286 299 338 342 363 396 414 418 429 437 468 484 494 506 507 529 572 598 627 676 684 726 741 759 828 836 858 874 897 988 1012 1014 1058 1089 1196 1254 1287 1311 1331 1452 1482 1518 1521 1573 1587 1716 1748 1794 1859 1881 2028 2116 2178 2223 2277 2299 2508 2574 2622 2662 2691 2717 2783 2964 3036 3042 3146 3174 3211 3289 3588 3718 3762 3887 3933 3993 4356 4446 4554 4598 4719 4761 4807 5148 5244 5324 5382 5434 5566 5577 5681 5819 6084 6292 6348 6422 6578 6877 6897 7436 7524 7774 7866 7986 8151 8349 8892 9108 9196 9438 9522 9614 9633 9867 10051 10764 10868 11132 11154 11362 11638 11661 11979 12844 13156 13754 13794 14157 14421 15548 15732 15972 16302 16698 16731 17043 17303 17457 18876 19044 19228 19266 19734 20102 20449 20631 20691 22308 22724 23276 23322 23958 24453 25047 25289 27508 27588 28314 28842 28899 29601 29887 30153 30613 32604 33396 33462 34086 34606 34914 34983 35321 36179 38532 39468 40204 40898 41262 41382 42757 43263 46644 47916 48906 50094 50578 51129 51909 52371 52877 56628 57684 57798 59202 59774 60306 61226 61347 61893 62491 64009 66924 68172 69212 69828 69966 70642 72358 73853 75647 75867 81796 82524 82764 85514 86526 89401 89661 90459 91839 97812 100188 101156 102258 103818 104742 105754 105963 108537 110561 115596 118404 119548 120612 122452 122694 123786 124982 128018 128271 130663 139932 141284 144716 147706 151294 151734 155727 158631 171028 173052 178802 179322 180918 183678 184041 187473 192027 204516 207636 209484 211508 211926 217074 221122 221559 224939 226941 227601 245388 247572 249964 256036 256542 261326 268203 268983 275517 295412 302588 303468 311454 317262 317889 325611 328757 331683 357604 358644 361836 367356 368082 374946 384054 384813 388531 391989 397969 423852 434148 442244 443118 449878 453882 455202 470327 475893 513084 522652 536406 537966 551034 562419 576081 581647 622908 634524 635778 651222 657514 663366 664677 674817 680823 687401 704099 736164 749892 768108 769626 777062 783978 795938 804609 812383 832117 886236 899756 907764 910404 940654 951786 983411 986271 995049 1072812 1075932 1102068 1124838 1152162 1163294 1165593 1175967 1193907 1216171 1271556 1302444 1315028 1326732 1329354 1349634 1361646 1374802 1408198 1410981 1437293 1539252 1554124 1567956 1591876 1609218 1624766 1664234 1698619 1744941 1881308 1903572 1966822 1972542 1990098 2024451 2062203 2112297 2249676 2304324 2326588 2331186 2351934 2387814 2432342 2437149 2496351 2658708 2699268 2723292 2749604 2816396 2821962 2874586 2950233 2958813 3218436 3249532 3328468 3397238 3489882 3496779 3581721 3648513 3933644 3945084 3980196 4048902 4124406 4224594 4232943 4273841 4311879 4662372 4703868 4775628 4864684 4874298 4992702 5095857 5173597 5234823 5643924 5749172 5900466 5917626 6186609 6336891 6794476 6979764 6993558 7163442 7297026 7311447 7489053 7561411 8097804 8248812 8449188 8465886 8547682 8623758 8850699 8936213 9153287 9748596 9985404 10191714 10347194 10469646 10817521 10945539 11800932 11835252 12373218 12673782 12821523 12935637 13377881 13987116 14326884 14594052 14622894 14978106 15122822 15287571 15520791 15810223 16931772 17095364 17247516 17701398 17872426 18306574 18684809 20383428 20694388 20939292 21635042 21891078 22684233 24746436 25347564 25643046 25871274 26755762 26808639 27459861 29245788 29956212 30245644 30575142 31041582 31620446 32452563 35402796 35744852 36613148 37369618 38464569 40133643 43270084 43782156 45368466 46562373 47430669 51286092 51742548 53511524 53617278 54919722 56054427 61150284 62083164 63240892 64905126 68052699 74739236 76929138 80267286 80425917 82379583 90736932 93124746 94861338 97357689 98298343 107234556 109839444 112108854 118992731 120400929 129810252 136105398 142292007 153858276 160534572 160851834 164759166 168163281 173912453 186249492 189722676 194715378 196596686 205532899 224217708 237985462 240801858 272210796 284584014 294895029 321703668 329518332 336326562 347824906 356978193 389430756 393193372 411065798 475970924 481603716 521737359 569168028 589790058 616598697 672653124 695649812 713956386 822131596 884685087 1043474718 1070934579 1179580116 1233197394 1427912772 1565212077 1769370174 1849796091 2086949436 2141869158 2260861889 2466394788 3130424154 3538740348 3699592182 4283738316 4521723778 6260848308 6782585667 7399184364 9043447556 13565171334 20347757001 27130342668 40695514002 81391028004
• Sum of all divisors σ(n): 269642711520
• Sum of proper divisors (its aliquot sum) s(n): 188251683516
• 81391028004 is an abundant number, because the sum of its proper divisors (188251683516) is greater than itself. Its abundance is 106860655512

Bases of 81391028004

• Binary: 1001011110011010010001000011100100100₂
• Hexadecimal: 0x12F3488724
• Base-36: 11E24750

Squares and roots of 81391028004

• 81391028004 squared (81391028004²) is 6624499439547912224016
• 81391028004 cubed (81391028004³) is 539174819396726428924620177344064
• The square root of 81391028004 is 285291.1285056019
• The cube root of 81391028004 is 4333.7000058613

Scales and comparisons

• 81,391,028,004 seconds is equal to 2,587 years, 51 weeks, 18 hours, 53 minutes, 24 seconds.
• To count from 1 to 81,391,028,004 would take you about five thousand, one hundred seventy-five 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 81391028004 cubic inches would be around 361.1 feet tall.

Recreational maths with 81391028004

• 81391028004 backwards is 40082019318
• 81391028004 is a Harshad number.
• The number of decimal digits it has is: 11
• The sum of 81391028004's digits is 36
• More coming soon!