644685649920

Names of 644685649920

• Cardinal: 644685649920 can be written as Six hundred forty-four billion, six hundred eighty-five million, six hundred forty-nine thousand, nine hundred twenty.

Scientific notation

• Scientific notation: 6.4468564992 × 10¹¹

Factors of 644685649920

• Number of distinct prime factors ω(n): 7
• Total number of prime factors Ω(n): 18
• Sum of prime factors: 392

Divisors of 644685649920

• Number of divisors d(n): 1152
• Complete list of divisors:
  1 2 3 4 5 6 8 9 10 12 13 15 16 18 19 20 24 26 30 32 36 38 39 40 45 48 52 57 60 64 65 72 76 78 80 90 95 96 104 114 117 120 127 128 130 144 152 156 160 171 180 190 192 195 208 223 228 234 240 247 254 256 260 285 288 304 312 320 342 360 380 381 384 390 416 446 456 468 480 494 508 512 520 570 576 585 608 624 635 640 669 684 720 741 760 762 768 780 832 855 892 912 936 960 988 1016 1024 1040 1115 1140 1143 1152 1170 1216 1235 1248 1270 1280 1338 1368 1440 1482 1520 1524 1536 1560 1651 1664 1710 1784 1824 1872 1905 1920 1976 2007 2032 2048 2080 2223 2230 2280 2286 2304 2340 2413 2432 2470 2496 2540 2560 2676 2736 2880 2899 2964 3040 3048 3072 3120 3302 3328 3345 3420 3568 3648 3705 3744 3810 3840 3952 4014 4064 4160 4237 4446 4460 4560 4572 4608 4680 4826 4864 4940 4953 4992 5080 5120 5352 5472 5715 5760 5798 5928 6080 6096 6144 6240 6604 6656 6690 6840 7136 7239 7296 7410 7488 7620 7680 7904 8028 8128 8255 8320 8474 8697 8892 8920 9120 9144 9216 9360 9652 9728 9880 9906 9984 10035 10160 10240 10704 10944 11115 11430 11520 11596 11856 12065 12160 12192 12480 12711 13208 13312 13380 13680 14272 14478 14495 14592 14820 14859 14976 15240 15360 15808 16056 16256 16510 16640 16948 17394 17784 17840 18240 18288 18432 18720 19304 19456 19760 19812 19968 20070 20320 21185 21408 21717 21888 22230 22860 23040 23192 23712 24130 24320 24384 24765 24960 25422 26091 26416 26624 26760 27360 28321 28544 28956 28990 29184 29640 29718 29952 30480 30720 31369 31616 32112 32512 33020 33280 33896 34788 35568 35680 36195 36480 36576 37440 38133 38608 38912 39520 39624 39936 40140 40640 42370 42816 43434 43485 43776 44460 45720 46080 46384 47424 48260 48640 48768 49530 49920 50844 52182 52832 53520 54720 55081 56642 57088 57912 57980 58368 59280 59436 59904 60960 62738 63232 63555 64224 65024 66040 66560 67792 69576 71136 71360 72390 72960 73152 74295 74880 76266 77216 79040 79248 79872 80280 81280 84740 84963 85632 86868 86970 87552 88920 91440 92160 92768 94107 94848 96520 97280 97536 99060 99840 101688 104364 105664 107040 108585 109440 110162 113284 114176 115824 115960 116736 118560 118872 119808 121920 125476 126464 127110 128448 130048 130455 132080 133120 135584 139152 141605 142272 142720 144780 145920 146304 148590 149760 152532 154432 156845 158080 158496 160560 162560 165243 169480 169926 171264 173736 173940 175104 177840 182880 185536 188214 189696 190665 193040 194560 195072 198120 199680 203376 208728 211328 214080 217170 218880 220324 226568 228352 231648 231920 237120 237744 239616 243840 250952 252928 254220 254889 256896 260096 260910 264160 271168 275405 278304 282321 283210 284544 285440 289560 291840 292608 297180 299520 305064 308864 313690 316160 316992 321120 325120 330486 338960 339852 342528 347472 347880 350208 355680 365760 368173 371072 376428 379392 381330 386080 390144 396240 399360 406752 417456 422656 424815 428160 434340 437760 440648 453136 456704 463296 463840 470535 474240 475488 487680 495729 501904 505856 508440 509778 513792 521820 528320 538099 542336 550810 556608 564642 566420 569088 570880 579120 583680 585216 594360 599040 610128 617728 627380 632320 633984 642240 650240 660972 677920 679704 685056 694944 695760 711360 731520 736346 742144 752856 758784 762660 772160 780288 792480 813504 826215 834912 845312 849630 856320 868680 875520 881296 906272 926592 927680 941070 948480 950976 975360 991458 1003808 1016880 1019556 1027584 1043640 1056640 1076198 1084672 1101620 1104519 1113216 1129284 1132840 1138176 1141760 1158240 1170432 1188720 1198080 1220256 1235456 1254760 1264640 1267968 1274445 1284480 1300480 1321944 1355840 1359408 1370112 1389888 1391520 1411605 1422720 1463040 1472692 1484288 1505712 1517568 1525320 1544320 1584960 1614297 1627008 1652430 1669824 1690624 1699260 1712640 1737360 1751040 1762592 1812544 1840865 1853184 1855360 1882140 1896960 1901952 1950720 1982916 2007616 2033760 2039112 2055168 2087280 2113280 2152396 2169344 2203240 2209038 2226432 2258568 2265680 2276352 2283520 2316480 2340864 2377440 2440512 2470912 2478645 2509520 2529280 2535936 2548890 2568960 2643888 2690495 2711680 2718816 2779776 2783040 2823210 2845440 2926080 2945384 2968576 3011424 3050640 3088640 3169920 3228594 3254016 3304860 3313557 3339648 3381248 3398520 3425280 3474720 3525184 3625088 3681730 3706368 3710720 3764280 3793920 3803904 3901440 3965832 4015232 4067520 4078224 4110336 4174560 4226560 4304792 4338688 4406480 4418076 4452864 4517136 4531360 4552704 4632960 4754880 4842891 4881024 4941824 4957290 5019040 5071872 5097780 5137920 5287776 5380990 5423360 5437632 5522595 5559552 5566080 5646420 5690880 5852160 5890768 5937152 6022848 6101280 6177280 6339840 6457188 6508032 6609720 6627114 6679296 6797040 6850560 6949440 6995287 7050368 7250176 7363460 7412736 7421440 7528560 7587840 7607808 7931664 8030464 8071485 8135040 8156448 8349120 8453120 8609584 8677376 8812960 8836152 8905728 9034272 9062720 9265920 9509760 9685782 9762048 9914580 10038080 10143744 10195560 10275840 10575552 10761980 10846720 10875264 11045190 11119104 11132160 11292840 11381760 11704320 11781536 12045696 12202560 12354560 12679680 12914376 13016064 13219440 13254228 13358592 13594080 13898880 13990574 14100736 14500352 14726920 14825472 14842880 15057120 15215616 15863328 16060928 16142970 16270080 16312896 16567785 16698240 16906240 17219168 17625920 17672304 17811456 18068544 18125440 18531840 19019520 19371564 19524096 19829160 20076160 20391120 20551680 20985861 21151104 21523960 21693440 21750528 22090380 22238208 22264320 22585680 22763520 23563072 24091392 24214455 24405120 24709120 25359360 25828752 26032128 26438880 26508456 26717184 27188160 27797760 27981148 28201472 29000704 29453840 29685760 30114240 30431232 31726656 32121856 32285940 32540160 32625792 33135570 33396480 34438336 34976435 35251840 35344608 36137088 36250880 37063680 38039040 38743128 39048192 39658320 40152320 40782240 41971722 42302208 43047920 43386880 43501056 44180760 44476416 44528640 45171360 47126144 48182784 48428910 48810240 50718720 51657504 52877760 53016912 53434368 54376320 55595520 55962296 56402944 58001408 58907680 60228480 62957583 63453312 64243712 64571880 65080320 65251584 66271140 66792960 68876672 69952870 70503680 70689216 72274176 72501760 74127360 76078080 77486256 78096384 79316640 80304640 81564480 83943444 84604416 86095840 87002112 88361520 89057280 90342720 94252288 96365568 96857820 97620480 103315008 104929305 105755520 106033824 108752640 111191040 111924592 112805888 117815360 120456960 125915166 126906624 129143760 130160640 130503168 132542280 133585920 137753344 139905740 141007360 141378432 144548352 145003520 152156160 154972512 158633280 160609280 163128960 167886888 169208832 172191680 174004224 176723040 180685440 188504576 192731136 193715640 195240960 206630016 209858610 211511040 212067648 217505280 222382080 223849184 235630720 240913920 251830332 253813248 258287520 261006336 265084560 267171840 275506688 279811480 282014720 282756864 289096704 290007040 309945024 314787915 317266560 321218560 326257920 335773776 338417664 344383360 353446080 361370880 377009152 387431280 390481920 413260032 419717220 423022080 424135296 435010560 447698368 471261440 481827840 503660664 507626496 516575040 522012672 530169120 551013376 559622960 564029440 565513728 578193408 619890048 629575830 634533120 652515840 671547552 688766720 706892160 722741760 754018304 774862560 826520064 839434440 846044160 848270592 870021120 895396736 942522880 963655680 1007321328 1015252992 1033150080 1060338240 1102026752 1119245920 1131027456 1239780096 1259151660 1269066240 1305031680 1343095104 1377533440 1413784320 1445483520 1549725120 1653040128 1678868880 1692088320 1696541184 1790793472 1885045760 2014642656 2066300160 2120676480 2238491840 2262054912 2479560192 2518303320 2538132480 2610063360 2686190208 2755066880 2827568640 2890967040 3099450240 3306080256 3357737760 3393082368 3581586944 3770091520 4029285312 4132600320 4241352960 4476983680 4959120384 5036606640 5076264960 5372380416 5510133760 5655137280 6198900480 6715475520 6786164736 7163173888 8058570624 8265200640 8482705920 8953967360 9918240768 10073213280 10744760832 11310274560 12397800960 13430951040 14326347776 16117141248 16530401280 16965411840 17907934720 20146426560 21489521664 24795601920 26861902080 32234282496 33930823680 35815869440 40292853120 42979043328 49591203840 53723804160 64468564992 71631738880 80585706240 107447608320 128937129984 161171412480 214895216640 322342824960 644685649920
• Sum of all divisors σ(n): 2564274585600
• Sum of proper divisors (its aliquot sum) s(n): 1919588935680
• 644685649920 is an abundant number, because the sum of its proper divisors (1919588935680) is greater than itself. Its abundance is 1274903285760

Bases of 644685649920

• Binary: 1001011000011010010000100101100000000000₂
• Hexadecimal: 0x961A425800
• Base-36: 885X6V40

Squares and roots of 644685649920

• 644685649920 squared (644685649920²) is 415619587212772796006400
• 644685649920 cubed (644685649920³) is 267943983701748551318681564479488000
• The square root of 644685649920 is 802923.1905481371
• The cube root of 644685649920 is 8638.7187400475

Scales and comparisons

• 644,685,649,920 seconds is equal to 20,499 years, 3 days, 11 hours, 12 minutes.
• To count from 1 to 644,685,649,920 would take you about forty thousand, nine hundred ninety-eight 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 644685649920 cubic inches would be around 719.9 feet tall.

Recreational maths with 644685649920

• 644685649920 backwards is 029946586446
• The number of decimal digits it has is: 12
• The sum of 644685649920's digits is 63
• More coming soon!