81365736816

Names of 81365736816

• Cardinal: 81365736816 can be written as Eighty-one billion, three hundred sixty-five million, seven hundred thirty-six thousand, eight hundred sixteen.

Scientific notation

• Scientific notation: 8.1365736816 × 10¹⁰

Factors of 81365736816

• Number of distinct prime factors ω(n): 6
• Total number of prime factors Ω(n): 13
• Sum of prime factors: 393

Divisors of 81365736816

• Number of divisors d(n): 640
• Complete list of divisors:
  1 2 3 4 6 7 8 9 12 13 14 16 18 21 24 26 27 28 36 37 39 42 48 52 54 56 63 72 74 78 84 91 104 108 111 112 117 126 144 148 156 168 169 182 189 208 216 222 234 252 259 273 296 312 331 333 336 338 351 364 378 432 444 468 481 504 507 518 546 592 624 662 666 676 702 728 756 777 819 888 936 962 993 999 1008 1014 1036 1092 1183 1324 1332 1352 1404 1443 1456 1512 1521 1554 1638 1776 1872 1924 1986 1998 2028 2072 2184 2197 2317 2331 2366 2457 2648 2664 2704 2808 2886 2979 3024 3042 3108 3276 3367 3549 3848 3972 3996 4056 4144 4303 4329 4368 4394 4563 4634 4662 4732 4914 5296 5328 5616 5772 5958 6084 6216 6253 6552 6591 6734 6951 6993 7098 7696 7944 7992 8112 8606 8658 8788 8937 9126 9268 9324 9464 9828 10101 10647 11544 11916 12168 12247 12432 12506 12909 12987 13104 13182 13468 13902 13986 14196 15379 15888 15984 17212 17316 17576 17874 18252 18536 18648 18759 18928 19656 19773 20202 20853 21294 23088 23832 24336 24494 25012 25818 25974 26364 26936 27804 27972 28392 30121 30303 30758 31941 34424 34632 35152 35748 36504 36741 37072 37296 37518 38727 39312 39546 40404 41706 42588 43771 46137 47664 48988 50024 51636 51948 52728 53872 55608 55939 55944 56277 56784 59319 60242 60606 61516 62559 63882 68848 69264 71496 73008 73482 75036 77454 79092 80808 81289 83412 85176 85729 87542 90363 90909 92274 97976 100048 103272 103896 105456 110223 111216 111878 111888 112554 116181 118638 120484 121212 123032 125118 127764 131313 138411 142992 146964 150072 154908 158184 159211 161616 162578 166824 167817 168831 170352 171458 175084 180726 181818 184548 195952 206544 207792 220446 223756 225108 232362 237276 240968 242424 243867 246064 250236 255528 257187 262626 271089 276822 293928 300144 309816 316368 318422 325156 330669 333648 335634 337662 342916 350168 361452 363636 369096 391573 393939 415233 440892 447512 450216 464724 474552 477633 481936 484848 487734 500472 503451 511056 514374 525252 542178 553644 569023 587856 619632 636844 650312 661338 671268 675324 685832 700336 722904 727207 727272 731601 738192 771561 783146 787878 813267 830466 881784 895024 900432 929448 949104 955266 975468 1000944 1006902 1028748 1050504 1084356 1107288 1114477 1138046 1174719 1181817 1273688 1300624 1322676 1342536 1350648 1371664 1432899 1445808 1454414 1454544 1463202 1510353 1543122 1566292 1575756 1626534 1660932 1707069 1763568 1858896 1910532 1950936 2013804 2057496 2069743 2101008 2168712 2181621 2194803 2214576 2228954 2276092 2314683 2349438 2363634 2547376 2645352 2685072 2701296 2865798 2908828 2926404 3020706 3086244 3132584 3151512 3253068 3321864 3343431 3414138 3524157 3821064 3901872 4027608 4114992 4139486 4298697 4337424 4363242 4389606 4457908 4552184 4629366 4698876 4727268 5090449 5121207 5290704 5731596 5817656 5852808 6041412 6172488 6209229 6265168 6303024 6506136 6544863 6643728 6686862 6828276 7048314 7642128 8055216 8278972 8597394 8726484 8779212 8915816 9104368 9258732 9397752 9454536 10030293 10180898 10242414 10572471 11463192 11635312 11705616 12082824 12344976 12418458 13012272 13089726 13373724 13656552 14096628 14488201 15271347 15363621 16557944 17194788 17452968 17558424 17831632 18517464 18627687 18795504 18909072 19634589 20060586 20361796 20484828 21144942 22926384 24165648 24836916 26179452 26747448 26906659 27313104 28193256 28976402 30090879 30542694 30727242 33115888 34389576 34905936 35116848 37034928 37255374 39269178 40121172 40723592 40969656 42289884 43464603 45814041 49673832 52358904 53494896 53813318 55883061 56386512 57952804 60181758 61085388 61454484 68779152 74510748 78538356 80242344 80719977 81447184 81939312 84579768 86929206 91628082 99347664 104717808 107626636 111766122 115905608 120363516 122170776 122908968 130393809 137442123 149021496 157076712 160484688 161439954 169159536 173858412 183256164 188346613 215253272 223532244 231811216 240727032 242159931 244341552 245817936 260787618 274884246 298042992 314153424 322879908 347716824 366512328 376693226 391181427 430506544 447064488 481454064 484319862 521575236 549768492 565039839 645759816 695433648 726479793 733024656 753386452 782362854 894128976 968639724 1043150472 1099536984 1130079678 1291519632 1452959586 1506772904 1564725708 1695119517 1937279448 2086300944 2199073968 2260159356 2905919172 3013545808 3129451416 3390239034 3874558896 4520318712 5085358551 5811838344 6258902832 6780478068 9040637424 10170717102 11623676688 13560956136 20341434204 27121912272 40682868408 81365736816
• Sum of all divisors σ(n): 297858713600
• Sum of proper divisors (its aliquot sum) s(n): 216492976784
• 81365736816 is an abundant number, because the sum of its proper divisors (216492976784) is greater than itself. Its abundance is 135127239968

Bases of 81365736816

• Binary: 1001011110001110001101001110101110000₂
• Hexadecimal: 0x12F1C69D70
• Base-36: 11DN24C0

Squares and roots of 81365736816

• 81365736816 squared (81365736816²) is 6620383127610577817856
• 81365736816 cubed (81365736816³) is 538672351182249217665358881386496
• The square root of 81365736816 is 285246.7998348097
• The cube root of 81365736816 is 4333.2510793275

Scales and comparisons

• 81,365,736,816 seconds is equal to 2,587 years, 9 weeks, 2 days, 1 hour, 33 minutes, 36 seconds.
• To count from 1 to 81,365,736,816 would take you about five thousand, one hundred seventy-four 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 81365736816 cubic inches would be around 361.1 feet tall.

Recreational maths with 81365736816

• 81365736816 backwards is 61863756318
• 81365736816 is a Harshad number.
• The number of decimal digits it has is: 11
• The sum of 81365736816's digits is 54
• More coming soon!