81968721920

Names of 81968721920

• Cardinal: 81968721920 can be written as Eighty-one billion, nine hundred sixty-eight million, seven hundred twenty-one thousand, nine hundred twenty.

Scientific notation

• Scientific notation: 8.196872192 × 10¹⁰

Factors of 81968721920

• Number of distinct prime factors ω(n): 6
• Total number of prime factors Ω(n): 17
• Sum of prime factors: 193

Divisors of 81968721920

• Number of divisors d(n): 416
• Complete list of divisors:
  1 2 4 5 8 10 16 20 31 32 40 41 47 62 64 67 80 82 94 124 128 134 155 160 164 188 205 235 248 256 268 310 320 328 335 376 410 470 496 512 536 620 640 656 670 752 820 940 992 1024 1072 1240 1271 1280 1312 1340 1457 1504 1640 1880 1927 1984 2048 2077 2144 2480 2542 2560 2624 2680 2747 2914 3008 3149 3280 3760 3854 3968 4096 4154 4288 4960 5084 5120 5248 5360 5494 5828 6016 6298 6355 6560 7285 7520 7708 7936 8308 8576 9635 9920 10168 10240 10385 10496 10720 10988 11656 12032 12596 12710 13120 13735 14570 15040 15416 15745 15872 16616 17152 19270 19840 20336 20480 20770 20992 21440 21976 23312 24064 25192 25420 26240 27470 29140 30080 30832 31490 31744 33232 34304 38540 39680 40672 41540 41984 42880 43952 46624 48128 50384 50840 52480 54940 58280 59737 60160 61664 62980 63488 66464 68608 77080 79360 81344 83080 83968 85157 85760 87904 93248 96256 97619 100768 101680 104960 109880 116560 119474 120320 123328 125960 126976 129109 132928 137216 154160 158720 162688 166160 167936 170314 171520 175808 186496 192512 195238 201536 203360 209920 219760 233120 238948 240640 246656 251920 258218 265856 274432 298685 308320 317440 325376 332320 340628 343040 351616 372992 390476 403072 406720 419840 425785 439520 466240 477896 481280 488095 493312 503840 516436 531712 597370 616640 634880 645545 650752 664640 681256 686080 703232 745984 780952 806144 813440 839680 851570 879040 932480 955792 962560 976190 986624 1007680 1032872 1063424 1194740 1233280 1291090 1301504 1329280 1362512 1372160 1406464 1491968 1561904 1612288 1626880 1703140 1758080 1864960 1911584 1952380 1973248 2015360 2065744 2126848 2389480 2466560 2582180 2603008 2658560 2725024 2812928 2983936 3123808 3224576 3253760 3406280 3516160 3729920 3823168 3904760 3946496 4002379 4030720 4131488 4253696 4778960 4933120 5164360 5206016 5317120 5450048 5625856 5967872 6247616 6449152 6507520 6812560 7032320 7459840 7646336 7809520 7892992 8004758 8061440 8262976 8507392 9557920 9866240 10328720 10634240 10900096 11251712 12495232 12898304 13015040 13625120 14064640 14919680 15292672 15619040 16009516 16122880 16525952 19115840 19732480 20011895 20657440 21268480 21800192 24990464 26030080 27250240 28129280 29839360 30585344 31238080 32019032 32245760 33051904 38231680 39464960 40023790 41314880 42536960 43600384 49980928 54500480 56258560 61170688 62476160 64038064 64491520 66103808 76463360 80047580 82629760 87200768 99961856 109000960 122341376 124952320 128076128 132207616 152926720 160095160 165259520 174401536 199923712 218001920 244682752 249904640 256152256 264415232 305853440 320190320 330519040 348803072 399847424 436003840 499809280 512304512 528830464 611706880 640380640 661038080 872007680 999618560 1024609024 1223413760 1280761280 1322076160 1744015360 1999237120 2049218048 2561522560 2644152320 4098436096 5123045120 8196872192 10246090240 16393744384 20492180480 40984360960 81968721920
• Sum of all divisors σ(n): 215594459136
• Sum of proper divisors (its aliquot sum) s(n): 133625737216
• 81968721920 is an abundant number, because the sum of its proper divisors (133625737216) is greater than itself. Its abundance is 51657015296

Bases of 81968721920

• Binary: 1001100010101101101110111000000000000₂
• Hexadecimal: 0x1315B77000
• Base-36: 11NM26M8

Squares and roots of 81968721920

• 81968721920 squared (81968721920²) is 6718871373198288486400
• 81968721920 cubed (81968721920³) is 550737299205939049961659301888000
• The square root of 81968721920 is 286301.8021598885
• The cube root of 81968721920 is 4343.9290291803

Scales and comparisons

• 81,968,721,920 seconds is equal to 2,606 years, 18 weeks, 2 days, 1 hour, 25 minutes, 20 seconds.
• To count from 1 to 81,968,721,920 would take you about five thousand, two hundred twelve 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 81968721920 cubic inches would be around 362 feet tall.

Recreational maths with 81968721920

• 81968721920 backwards is 02912786918
• The number of decimal digits it has is: 11
• The sum of 81968721920's digits is 53
• More coming soon!