81497187720

Names of 81497187720

• Cardinal: 81497187720 can be written as Eighty-one billion, four hundred ninety-seven million, one hundred eighty-seven thousand, seven hundred twenty.

Scientific notation

• Scientific notation: 8.149718772 × 10¹⁰

Factors of 81497187720

• Number of distinct prime factors ω(n): 5
• Total number of prime factors Ω(n): 13
• Sum of prime factors: 130

Divisors of 81497187720

• Number of divisors d(n): 480
• Complete list of divisors:
  1 2 3 4 5 6 8 9 10 12 13 15 18 20 24 26 27 30 36 39 40 45 52 54 60 65 72 78 81 90 104 107 108 117 120 130 135 156 162 169 180 195 214 216 234 260 270 312 321 324 338 351 360 390 405 428 468 507 520 535 540 585 642 648 676 702 780 810 845 856 936 963 1014 1053 1070 1080 1170 1284 1352 1391 1404 1521 1560 1605 1620 1690 1755 1926 2028 2106 2140 2197 2340 2535 2568 2782 2808 2889 3042 3210 3240 3380 3510 3852 4056 4173 4212 4280 4394 4563 4680 4815 5070 5265 5564 5778 6084 6420 6591 6760 6955 7020 7605 7704 8346 8424 8667 8788 9126 9630 10140 10530 10985 11128 11449 11556 12168 12519 12840 13182 13689 13910 14040 14445 15210 16692 17334 17576 18083 18252 19260 19773 20280 20865 21060 21970 22815 22898 23112 25038 26364 27378 27820 28890 30420 32955 33384 34347 34668 36166 36504 37557 38520 39546 41730 42120 43335 43940 45630 45796 50076 52728 54249 54756 55640 57245 57780 59319 60840 62595 65910 68445 68694 69336 72332 75114 79092 83460 86670 87880 90415 91260 91592 98865 100152 103041 108498 109512 112671 114490 115560 118638 125190 131820 136890 137388 144664 148837 150228 158184 162747 166920 171735 173340 177957 180830 182520 187785 197730 206082 216996 225342 228980 235079 237276 250380 263640 271245 273780 274776 296595 297674 300456 309123 325494 343470 346680 355914 361660 375570 395460 412164 433992 446511 450684 457960 470158 474552 488241 500760 515205 542490 547560 563355 593190 595348 618246 650988 686940 705237 711828 723320 744185 751140 790920 813735 824328 889785 893022 901368 927369 940316 976482 1030410 1084980 1126710 1175395 1186380 1190696 1236492 1301976 1339533 1373880 1410474 1423656 1464723 1488370 1502280 1545615 1627470 1779570 1786044 1854738 1880632 1934881 1952964 2060820 2115711 2169960 2232555 2253420 2350790 2372760 2441205 2472984 2679066 2820948 2929446 2976740 3091230 3254940 3526185 3559140 3572088 3709476 3869762 3905928 4018599 4121640 4231422 4465110 4506840 4636845 4701580 4882410 5358132 5641896 5804643 5858892 5953480 6182460 6347133 6509880 6697665 7052370 7118280 7323615 7418952 7739524 8037198 8462844 8930220 9273690 9403160 9674405 9764820 10578555 10716264 11609286 11717784 12055797 12364920 12694266 13395330 14104740 14647230 15479048 16074396 16925688 17413929 17860440 18547380 19041399 19348810 19529640 20092995 21157110 23218572 24111594 25153453 25388532 26790660 28209480 29023215 29294460 31735665 32148792 34827858 37094760 38082798 38697620 40185990 42314220 46437144 48223188 50306906 50777064 52241787 53581320 58046430 58588920 60278985 63471330 69655716 75460359 76165596 77395240 80371980 84628440 87069645 95206995 96446376 100613812 104483574 116092860 120557970 125767265 126942660 139311432 150920718 152331192 156725361 160743960 174139290 190413990 201227624 208967148 226381077 232185720 241115940 251534530 253885320 261208935 301841436 313450722 348278580 377301795 380827980 417934296 452762154 482231880 503069060 522417870 603682872 626901444 679143231 696557160 754603590 761655960 783626805 905524308 1006138120 1044835740 1131905385 1253802888 1358286462 1509207180 1567253610 1811048616 2037429693 2089671480 2263810770 2716572924 3018414360 3134507220 3395716155 4074859386 4527621540 5433145848 6269014440 6791432310 8149718772 9055243080 10187148465 13582864620 16299437544 20374296930 27165729240 40748593860 81497187720
• Sum of all divisors σ(n): 299536637400
• Sum of proper divisors (its aliquot sum) s(n): 218039449680
• 81497187720 is an abundant number, because the sum of its proper divisors (218039449680) is greater than itself. Its abundance is 136542261960

Bases of 81497187720

• Binary: 1001011111001100111000110010110001000₂
• Hexadecimal: 0x12F99C6588
• Base-36: 11FTBKI0

Squares and roots of 81497187720

• 81497187720 squared (81497187720²) is 6641791606268918798400
• 81497187720 cubed (81497187720³) is 541287337333218404114641635648000
• The square root of 81497187720 is 285477.1229363221
• The cube root of 81497187720 is 4335.5833603893

Scales and comparisons

• 81,497,187,720 seconds is equal to 2,591 years, 18 weeks, 4 days, 11 hours, 42 minutes.
• To count from 1 to 81,497,187,720 would take you about five thousand, one hundred eighty-two 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 81497187720 cubic inches would be around 361.3 feet tall.

Recreational maths with 81497187720

• 81497187720 backwards is 02778179418
• 81497187720 is a Harshad number.
• The number of decimal digits it has is: 11
• The sum of 81497187720's digits is 54
• More coming soon!