55272205770600
55,272,205,770,600 is an even composite number composed of nine prime numbers multiplied together.
55272205770600 is an even composite number. It is composed of nine distinct prime numbers multiplied together. It has a total of two thousand, three hundred four divisors.
Prime factorization of 55272205770600:
23 × 3 × 52 × 72 × 13 × 17 × 43 × 181 × 1093
(2 × 2 × 2 × 3 × 5 × 5 × 7 × 7 × 13 × 17 × 43 × 181 × 1093)See below for interesting mathematical facts about the number 55272205770600 from the Numbermatics database.
Names of 55272205770600
- Cardinal: 55272205770600 can be written as Fifty-five trillion, two hundred seventy-two billion, two hundred five million, seven hundred seventy thousand, six hundred.
Scientific notation
- Scientific notation: 5.52722057706 × 1013
Factors of 55272205770600
Divisors of 55272205770600
- Number of divisors d(n): 2304
-
Complete list of divisors:
1 2 3 4 5 6 7 8 10 12 13 14 15 17 20 21 24 25 26 28 30 34 35 39 40 42 43 49 50 51 52 56 60 65 68 70 75 78 84 85 86 91 98 100 102 104 105 119 120 129 130 136 140 147 150 156 168 170 172 175 181 182 195 196 200 204 210 215 221 238 245 255 258 260 273 280 294 300 301 312 325 340 344 350 357 362 364 390 392 408 420 425 430 442 455 476 490 510 516 520 525 543 546 559 588 595 600 602 637 645 650 663 680 700 714 724 728 731 735 780 833 840 850 860 884 903 905 910 952 975 980 1020 1032 1050 1075 1086 1092 1093 1105 1118 1176 1190 1204 1225 1267 1274 1275 1290 1300 1326 1365 1400 1428 1448 1462 1470 1505 1547 1560 1666 1677 1700 1720 1768 1785 1806 1810 1820 1911 1950 1960 2040 2100 2107 2150 2172 2184 2186 2193 2210 2236 2275 2353 2380 2408 2450 2499 2534 2548 2550 2580 2600 2652 2715 2730 2795 2856 2924 2940 2975 3010 3077 3094 3185 3225 3279 3315 3332 3354 3400 3570 3612 3620 3640 3655 3675 3801 3822 3900 3913 4165 4200 4214 4300 4344 4372 4386 4420 4472 4515 4525 4550 4641 4706 4760 4900 4998 5068 5096 5100 5117 5160 5304 5430 5460 5465 5525 5590 5848 5880 5950 6020 6154 6188 6321 6335 6370 6450 6558 6630 6664 6708 6825 7059 7140 7224 7240 7310 7350 7525 7602 7644 7651 7735 7783 7800 7826 8330 8385 8428 8600 8744 8772 8840 8869 8925 9030 9050 9100 9231 9282 9412 9503 9555 9800 9996 10136 10200 10234 10535 10829 10860 10920 10930 10965 11050 11180 11739 11765 11900 12040 12308 12376 12495 12642 12670 12740 12900 13116 13260 13416 13575 13650 13975 14118 14209 14280 14620 14700 15050 15204 15288 15302 15351 15385 15470 15566 15652 15925 16395 16471 16575 16660 16770 16856 17544 17738 17850 18060 18100 18200 18275 18462 18564 18581 18824 19005 19006 19110 19565 19992 20468 20825 21070 21539 21658 21720 21860 21930 22100 22360 22575 22953 23205 23349 23478 23530 23800 24616 24990 25284 25340 25480 25585 25800 26232 26520 26607 27150 27300 27325 27391 27950 28236 28418 28509 29240 29400 30100 30408 30604 30702 30770 30940 31132 31304 31605 31675 31850 32487 32790 32942 33150 33320 33540 35295 35476 35700 35819 36120 36200 36550 36924 37128 37162 38010 38012 38220 38255 38675 38915 39130 40001 40936 41650 41925 42140 42627 43078 43316 43720 43860 44200 44345 45150 45906 46155 46410 46698 46956 46999 47060 47515 47775 49413 49980 50568 50680 51170 52675 53214 53557 54145 54300 54481 54600 54650 54782 54825 55743 55900 56472 56836 57018 58695 58825 60200 61208 61404 61540 61880 62264 62475 63210 63350 63700 64617 64974 65580 65884 66300 66521 67080 70590 70952 71045 71400 71638 73100 73848 74324 76020 76024 76440 76510 76755 76925 77350 77830 78260 80002 81975 82173 82355 83300 83850 84280 85254 86156 86632 87720 88690 90300 91812 92310 92820 92905 93396 93912 93998 94120 95025 95030 95550 97825 98826 99463 99960 101179 102340 105350 106428 107114 107457 107695 108290 108600 108962 109300 109564 109650 111486 111800 113672 114036 114765 115297 116025 116745 117390 117650 120003 122808 123080 124950 126420 126700 127400 127925 129234 129948 130067 131160 131768 132311 132600 133035 133042 136955 140997 141180 142090 142545 143276 146200 148648 150773 152040 153020 153510 153850 154700 155660 156520 158025 160004 160671 162435 163443 163950 164346 164710 166600 167700 170508 172312 176475 177380 179095 180600 183624 184620 185640 185810 186792 187996 190050 190060 191100 191275 194575 195650 197652 197833 198926 199563 200005 202358 204680 210700 212856 213135 214228 214914 215390 216580 217924 218600 219128 219300 221725 222972 228072 229530 230594 230775 232050 233490 234780 234995 235300 237575 240006 241553 247065 249900 252840 253400 255850 258468 259896 260134 264622 266070 266084 267785 270725 272405 273910 278715 280007 281994 282360 284180 285090 286552 293475 298389 301546 303537 306040 307020 307700 309400 311320 316050 320008 321342 323085 324870 326886 327900 328692 328993 329420 332605 335400 341016 345891 352950 354760 355225 358190 369240 371620 375992 380100 380120 381367 382200 382550 383775 389150 390201 391300 395304 395666 396933 397852 399126 400010 404716 410865 411775 421400 426270 428456 429828 430780 433160 435848 438600 443450 445944 452319 459060 461188 461550 464100 464525 465647 466980 469560 469990 470600 475150 480012 483106 494130 497315 499800 505895 511700 516936 520268 529244 532140 532168 535570 537285 538475 541450 544810 547820 557430 560014 563988 568360 570180 573825 576485 583725 586950 593499 596778 600015 603092 607074 610987 614040 615400 632100 642684 646170 649740 650335 653772 655800 657384 657986 658840 661555 665175 665210 684775 691782 696241 704985 705900 708253 710450 712725 716380 724659 743240 753865 760200 762734 765100 767550 778300 780402 782600 791332 793866 795704 798252 798983 800020 803355 809432 812175 817215 821730 823550 840021 852540 859656 861560 886900 895475 904638 910469 918120 922376 923100 926177 928200 929050 931294 933960 939980 950300 960024 966212 986979 988260 989165 994630 997815 1000025 1011790 1023400 1040536 1058488 1064280 1065675 1071140 1074570 1076950 1082900 1089620 1095640 1114860 1120028 1127976 1140360 1144101 1147650 1152970 1167450 1173900 1174975 1186998 1193556 1200030 1206184 1207765 1214148 1221974 1235325 1264200 1285368 1292340 1299480 1300670 1307544 1315972 1323110 1330350 1330420 1338925 1362025 1369550 1383564 1384831 1392482 1393575 1396941 1400035 1409970 1411800 1416506 1420900 1425450 1432760 1449318 1491945 1507730 1517685 1525468 1530200 1535100 1556600 1560804 1582664 1587732 1596504 1597966 1600040 1606710 1615425 1624350 1634430 1643460 1644965 1647100 1663025 1680042 1690871 1705080 1720043 1729455 1773800 1790950 1809276 1820938 1832961 1846200 1852354 1858100 1862588 1879960 1900600 1906835 1932424 1951005 1960049 1973958 1976520 1978330 1984665 1989260 1995630 2000050 2023580 2054325 2088723 2124759 2131350 2142280 2149140 2153900 2165800 2179240 2229720 2240056 2261595 2288202 2295300 2302951 2305940 2328235 2334900 2347800 2349950 2373996 2387112 2396949 2400060 2415530 2428296 2443948 2470650 2486575 2529475 2571829 2584680 2601340 2631944 2646220 2660700 2660840 2677850 2686425 2724050 2731407 2739100 2767128 2769662 2778531 2784964 2787150 2793882 2800070 2819940 2833012 2841800 2850900 2882425 2898636 2967495 2983890 3000075 3015460 3035370 3050936 3054935 3070200 3121608 3175464 3195932 3213420 3230850 3248700 3251675 3268860 3286920 3289930 3294200 3307775 3326050 3360084 3363161 3381742 3440086 3458910 3481205 3524925 3541265 3581900 3618552 3623295 3641876 3665922 3704708 3716200 3725176 3769325 3813670 3902010 3920098 3947916 3956660 3969330 3978520 3991260 3994915 4000100 4016775 4047160 4086075 4108650 4154493 4177446 4200105 4249518 4262700 4276909 4298280 4307800 4523190 4552345 4576404 4590600 4605902 4611880 4630885 4656470 4669800 4699900 4747992 4793898 4800120 4831060 4887896 4934895 4941300 4945825 4957771 4973150 4989075 5058950 5072613 5143658 5160129 5202680 5292440 5321400 5355700 5372850 5448100 5462814 5478200 5539324 5557062 5569928 5574300 5587764 5592881 5600140 5639880 5666024 5701800 5720505 5764850 5797272 5880147 5934990 5967780 6000150 6030920 6038825 6070740 6109870 6391864 6426840 6461700 6483239 6497400 6503350 6537720 6579860 6615550 6652100 6720168 6726322 6763484 6880172 6908853 6917820 6924155 6962410 6984705 7000175 7049850 7082530 7163800 7246590 7283752 7331844 7409416 7459725 7538650 7588425 7627340 7715487 7804020 7840196 7895832 7913320 7938660 7982520 7989830 8000200 8033550 8172150 8217300 8224825 8308986 8354892 8400210 8454355 8499036 8506819 8525400 8553818 8600215 8647275 9046380 9104690 9152808 9164805 9211804 9261770 9312940 9399800 9534175 9587796 9662120 9693817 9755025 9800245 9869790 9882600 9891650 9915542 9923325 9946300 9978150 10089483 10117900 10145226 10287316 10320258 10386779 10443615 10623795 10711400 10745700 10896200 10925628 11078648 11114124 11148600 11175528 11185762 11200280 11307975 11441010 11514755 11529700 11641175 11760294 11836097 11869980 11935560 11984745 12000300 12040301 12077650 12141480 12219740 12830727 12859145 12923400 12966478 13006700 13159720 13231100 13304200 13452644 13526968 13657035 13760344 13817706 13835640 13848310 13892655 13924820 13969410 14000350 14099700 14165060 14493180 14663688 14837475 14873313 14919450 15077300 15176850 15254680 15274675 15430974 15608040 15680392 15877320 15979660 16067100 16344300 16434600 16449650 16617972 16709784 16778643 16800420 16815805 16908710 16998072 17013638 17107636 17200430 17294550 17406025 17706325 18002803 18092760 18116475 18209380 18329610 18423608 18523540 18625880 19068350 19175592 19387634 19449717 19510050 19600490 19739580 19783300 19831084 19846650 19892600 19956300 19974575 20178966 20235800 20290452 20574632 20640516 20772465 20773558 20887230 21000525 21247590 21384545 21491400 21851256 22228248 22371524 22615950 22761725 22882020 23029510 23059400 23154425 23282350 23520588 23542127 23672194 23739960 23969490 24000600 24080602 24155300 24439480 24674475 24788855 25363065 25520457 25661454 25718290 25800645 25932956 26013400 26462200 26905288 27314070 27635412 27696620 27785310 27849640 27938820 27964405 28000700 28199400 28330120 28602525 28986360 29081451 29400735 29674950 29746626 29838900 29938363 30154600 30353700 30549350 30861948 31160337 31959320 32134200 32416195 32688600 32899300 33235944 33557286 33600840 33631610 33817420 34027276 34215272 34400860 34544265 34589100 34620775 34812050 34923525 35412650 35508291 36005606 36120903 36232950 36418760 36659220 37047080 38136700 38577435 38775268 38899434 39020100 39150167 39200980 39479160 39566600 39662168 39693300 39912600 39949150 40357932 40580904 41281032 41544930 41547116 41774460 42001050 42271775 42495180 42534095 42769090 43001075 43721093 44743048 45231900 45523450 45764040 45824025 46059020 46308850 46564700 47041176 47084254 47344388 47938980 48161204 48310600 48469085 49001225 49348950 49577710 50447415 50726130 51040914 51322908 51436580 51601290 51865912 51933895 52218075 53118975 54008409 54628140 55270824 55393240 55570620 55877640 55928810 56001400 57205050 57573775 58162902 58801470 59180485 59349900 59493252 59547733 59677800 59876726 59923725 60201505 60707400 61098700 61723896 62320674 64153635 64295725 64832390 65798600 67114572 67263220 67634840 68054552 68285175 68801720 69088530 69178200 69241550 69463275 69624100 69847050 70626381 70825300 71016582 72011212 72241806 72465900 72707453 73318440 74366565 76273400 77154870 77550536 77798868 78040200 78300334 78401960 79386600 79898300 80715864 83089860 83094232 83548920 83893215 84002100 84079025 84282107 84543550 84990360 85068190 85538180 86002150 87442186 89815089 90014015 90463800 91046900 91648050 92118040 92617700 93129400 94168508 94688776 95877960 96322408 96938170 97248585 98002450 98697900 99155420 100894830 101452260 102081828 102645816 102873160 103202580 103862325 103867790 104436150 106237950 106922725 108016818 109256280 110588647 111141240 111857620 114410100 115147550 116325804 117450501 117602940 117710635 118360970 118699800 118986504 119095466 119753452 119847450 120403010 122197400 123944275 124641348 126019621 126815325 127602285 128307270 128591450 129003225 129664780 131163279 134229144 134526440 136570350 138177060 138483100 138926550 139248200 139694100 139822025 141252762 141650600 142033164 144022424 144483612 144615923 144931800 145407255 145414906 147003675 148733130 149691815 154309740 155597736 155801685 156600668 159796600 162080975 164794889 166179720 167786430 168004200 168158050 168564214 169087100 170136380 171076360 172004300 172721325 174884372 177541455 178643199 179630178 180028030 180604515 182093800 183296100 185235400 188337016 192887175 193876340 194497170 195750835 196004900 197395800 198310840 201789660 202904520 204163656 206405160 207724650 207735580 208872300 212475900 212670475 213845450 216033636 218122359 218605465 221177294 223715240 228820200 230295100 232651608 234901002 235205880 235421270 236721940 238190932 239506904 239694900 240806020 242345425 247888550 249282696 252039242 252237075 252846321 253630650 255204570 256614540 257182900 258006450 259329560 259669475 262326558 270042045 273140700 276354120 276966200 277853100 279388200 279644050 282505524 284066328 288967224 289231846 290814510 290829812 294007350 295902425 297466260 297738665 299383630 301007525 306047651 308619480 311603370 313201336 320768175 324161950 329589778 331765941 335572860 336316100 337128428 338174200 340272760 344008600 345442650 349768744 353131905 355082910 357286398 359260356 360056060 361209030 363537265 366592200 371832825 378058863 385774350 387752680 388994340 391501670 392009800 403579320 415449300 415471160 416834131 417744600 419466075 421410535 424951800 425340950 427690900 432067272 433847769 436244718 437210930 442354588 449075445 450070075 460590200 469802004 470842540 473443880 476381864 479389800 481612040 484690850 486242925 494384667 495777100 504078484 504474150 505692642 507261300 508952171 510409140 513229080 514365800 516012900 519338950 524653116 540084090 546281400 552943235 555706200 559288100 565011048 578463692 581629020 581659624 587252505 588014700 588553175 591804850 594932520 595477330 598767260 602015050 612095302 623206740 630098105 638011425 641536350 648323900 655816395 659179556 663531882 671145720 672632200 674256856 690885300 706263810 710165820 714572796 718520712 720112120 722418060 723079615 727036275 727074530 743665650 748459075 756117726 771548700 774120529 777988680 779008425 783003340 823974445 830898600 833668262 838932150 842821070 850681900 855381800 867695538 872489436 874421860 884709176 887707275 893215995 898150890 900140150 903022575 918142953 939604008 941685080 969381700 972485850 978754175 988769334 991554200 1008156968 1008948300 1011385284 1012311461 1014522600 1017904342 1020818280 1032025800 1038677900 1049306232 1080168180 1090611795 1093027325 1105886470 1118576200 1156927384 1163258040 1174505010 1176029400 1177106350 1183609700 1190954660 1197534520 1204030100 1224190604 1246413480 1250502393 1260196210 1264231605 1276022850 1283072700 1296647800 1311632790 1318359112 1327063764 1350210225 1381770600 1412527620 1420331640 1429145592 1444836120 1446159230 1454072550 1454149060 1487331300 1488693325 1496918150 1512235452 1526856513 1530238255 1543097400 1548241058 1558016850 1566006680 1647948890 1658829705 1667336524 1677864300 1685642140 1701363800 1735391076 1744978872 1748843720 1765659525 1775414550 1786431990 1796301780 1800280300 1806045150 1817686325 1836285906 1880006999 1890294315 1938763400 1944971700 1957508350 1977538668 2017896600 2022770568 2024622922 2035808684 2077355800 2084170655 2107052675 2142333557 2160336360 2169238845 2181223590 2186054650 2211772940 2245377225 2322361587 2349010020 2354212700 2367219400 2381909320 2408060200 2448381208 2471923335 2501004786 2520392420 2528463210 2544760855 2552045700 2566145400 2623265580 2654127528 2700420450 2764716175 2825055240 2892318460 2908145100 2908298120 2936262525 2974662600 2977386650 2993836300 3024470904 3036934383 3053713026 3060476510 3096482116 3116033700 3150490525 3279081975 3295897780 3317659410 3334673048 3355728600 3371284280 3470782152 3531319050 3550829100 3572863980 3592603560 3600560600 3612090300 3615398075 3635372650 3672571812 3760013998 3780588630 3870602645 3889943400 3915016700 3955077336 4049245844 4071617368 4119872225 4168341310 4214105350 4284667114 4338477690 4362447180 4372109300 4423545880 4466079975 4490754450 4590714765 4644723174 4698020040 4708425400 4943846670 5002009572 5040784840 5056926420 5061557305 5089521710 5104091400 5246531160 5400840900 5418843703 5453058975 5529432350 5640020997 5784636920 5816290200 5872525050 5954773300 5987672600 6073868766 6107426052 6120953020 6192964232 6232067400 6252511965 6300981050 6321158025 6427000671 6558163950 6591795560 6635318820 7062638100 7086180227 7101658200 7145727960 7224180600 7230796150 7270745300 7345143624 7520027996 7561177260 7634282565 7651191275 7741205290 7830033400 8098491688 8239744450 8294148525 8336682620 8428210700 8569334228 8676955380 8724894360 8744218600 8932159950 8981508900 9181429530 9289446348 9400034995 9451471575 9887693340 10004019144 10113852840 10123114610 10179043420 10420853275 10711667785 10801681800 10837687406 10846194225 10906117950 11058864700 11280041994 11611807935 11745050100 11909546600 12147737532 12214852104 12241906040 12359616675 12505023930 12601962100 12642316050 12723804275 12854001342 13116327900 13160048993 13270637640 14125276200 14172360454 14461592300 14541490600 15040055992 15122354520 15184671915 15268565130 15302382550 15482410580 16256531109 16479488900 16588297050 16673365240 16856421400 17138668456 17353910760 17864319900 17963017800 18362859060 18578892696 18800069990 18902943150 19353013225 19775386680 20246229220 20358086840 20841706550 21258540681 21423335570 21675374812 21692388450 21812235900 22117729400 22560083988 22953573825 23223615870 23490100200 24295475064 24719233350 25010047860 25203924200 25284632100 25307786525 25447608550 25708002684 26232655800 26320097986 27094218515 28200104985 28344720908 28923184600 30369343830 30537130260 30604765100 30964821160 31262559825 32135003355 32513062218 32958977800 33176594100 35430901135 35728639800 36725718120 37600139980 37805886300 38171412825 38706026450 39480146979 40492458440 41683413100 42517081362 42846671140 43350749624 43384776900 43624471800 45120167976 45907147650 46447231740 47000174975 49438466700 50020095720 50569264200 50615573050 50895217100 51416005368 52640195972 53558338925 54188437030 56400209970 56689441816 58059039675 60738687660 61074260520 61209530200 62525119650 64270006710 65026124436 65800244965 66353188200 70861802270 75200279960 75611772600 75923359575 76342825650 77412052900 78960293958 81282655545 83366826200 85034162724 85693342280 86769553800 91814295300 92120342951 92894463480 94000349950 98876933400 101231146100 101790434200 105280391944 106292703405 107116677850 108376874060 112800419940 116118079350 121477375320 125050239300 128540013420 130052248872 131600489930 135471092575 141000524925 141723604540 151846719150 152685651300 154824105800 157920587916 160675016775 162565311090 170068325448 177154505675 183628590600 184240685902 188000699900 197400734895 202462292200 212585406810 214233355700 216753748120 225600839880 232236158700 250100478600 257080026840 263200979860 270942185150 276361028853 282001049850 283447209080 303693438300 305371302600 315841175832 321350033550 325130622180 329001224825 354309011350 368481371804 376001399800 394801469790 406413277725 425170813620 428466711400 460601714755 464472317400 526401959720 531463517025 541884370300 552722057706 564002099700 607386876600 642700067100 650261244360 658002449650 708618022700 736962743608 789602939580 812826555450 850341627240 921203429510 987003674475 1062927034050 1083768740600 1105444115412 1128004199400 1285400134200 1316004899300 1381805144265 1417236045400 1579205879160 1625653110900 1842406859020 1974007348950 2125854068100 2210888230824 2303008573775 2632009798600 2763610288530 3251306221800 3684813718040 3948014697900 4251708136200 4606017147550 5527220577060 6909025721325 7896029395800 9212034295100 11054441154120 13818051442650 18424068590200 27636102885300 55272205770600
- Sum of all divisors σ(n): 234061361614080
- Sum of proper divisors (its aliquot sum) s(n): 178789155843480
- 55272205770600 is an abundant number, because the sum of its proper divisors (178789155843480) is greater than itself. Its abundance is 123516950072880
Bases of 55272205770600
- Binary: 11001001000101000100000011000011011111011010002
- Hexadecimal: 0x32451030DF68
- Base-36: JLBP889RC
Squares and roots of 55272205770600
- 55272205770600 squared (552722057706002) is 3055016730747547939824360000
- 55272205770600 cubed (552722057706003) is 168857513374504165691360132342451816000000
-
The
square root of 55272205770600 is 7434527.9453775679 -
The
cube root of 55272205770600 is 38092.1599110423
Scales and comparisons
How big is 55272205770600?- 55,272,205,770,600 seconds is equal to 1,757,485 years, 9 weeks, 19 hours, 50 minutes.
-
To count from 1 to 55,272,205,770,600 would take you about four million, three hundred ninety-three thousand, seven 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 55272205770600 cubic inches would be around 3174.3 feet tall.
Recreational maths with 55272205770600
- 55272205770600 backwards is 00607750227255
- The number of decimal digits it has is: 14
- The sum of 55272205770600's digits is 48
- More coming soon!
Link to this page
HTML: To link to this page, just copy and paste the link below into your blog, web page or email.
BBCODE: To link to this page in a forum post or comment box, just copy and paste the link code below:
Cite this page
MLA style:
"Number 55272205770600 - Facts about the integer". Numbermatics.com. 2024. Web. 25 May 2024.
APA style:
Numbermatics. (2024). Number 55272205770600 - Facts about the integer. Retrieved 25 May 2024, from https://numbermatics.com/n/55272205770600/
Chicago style:
Numbermatics. 2024. "Number 55272205770600 - Facts about the integer". https://numbermatics.com/n/55272205770600/
The information we have on file for 55272205770600 includes mathematical data and numerical statistics calculated using standard algorithms and methods. We are adding more all the time. If there are any features you would like to see, please contact us. Information provided for educational use, intellectual curiosity and fun!
Keywords: Divisors of 55272205770600, math, Factors of 55272205770600, curriculum, school, college, exams, university, Prime factorization of 55272205770600, STEM, science, technology, engineering, physics, economics, calculator, fifty-five trillion, two hundred seventy-two billion, two hundred five million, seven hundred seventy thousand, six hundred.