44733609951660
44,733,609,951,660 is an even composite number composed of nine prime numbers multiplied together.
44733609951660 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 44733609951660:
22 × 33 × 5 × 72 × 31 × 37 × 61 × 73 × 331
(2 × 2 × 3 × 3 × 3 × 5 × 7 × 7 × 31 × 37 × 61 × 73 × 331)See below for interesting mathematical facts about the number 44733609951660 from the Numbermatics database.
Names of 44733609951660
- Cardinal: 44733609951660 can be written as Forty-four trillion, seven hundred thirty-three billion, six hundred nine million, nine hundred fifty-one thousand, six hundred sixty.
Scientific notation
- Scientific notation: 4.473360995166 × 1013
Factors of 44733609951660
Divisors of 44733609951660
- Number of divisors d(n): 2304
-
Complete list of divisors:
1 2 3 4 5 6 7 9 10 12 14 15 18 20 21 27 28 30 31 35 36 37 42 45 49 54 60 61 62 63 70 73 74 84 90 93 98 105 108 111 122 124 126 135 140 146 147 148 155 180 183 185 186 189 196 210 217 219 222 244 245 252 259 270 279 292 294 305 310 315 331 333 365 366 370 372 378 420 427 434 438 441 444 465 490 511 518 540 549 555 558 588 610 620 630 651 657 662 666 730 732 735 740 756 777 837 854 868 876 882 915 930 945 980 993 999 1022 1036 1085 1095 1098 1110 1116 1147 1220 1260 1281 1295 1302 1314 1323 1324 1332 1395 1460 1470 1519 1533 1554 1647 1655 1665 1674 1708 1764 1813 1830 1860 1890 1891 1953 1971 1986 1998 2044 2135 2170 2190 2196 2205 2220 2257 2263 2294 2317 2331 2555 2562 2590 2604 2628 2646 2701 2745 2790 2940 2979 2989 3038 3066 3108 3255 3285 3294 3310 3330 3348 3441 3577 3626 3660 3780 3782 3843 3885 3906 3942 3972 3996 4185 4270 4340 4380 4410 4453 4514 4526 4557 4588 4599 4634 4662 4965 4995 5110 5124 5180 5292 5402 5439 5490 5580 5673 5735 5859 5958 5978 6076 6132 6405 6510 6570 6588 6615 6620 6660 6771 6789 6882 6951 6993 7154 7252 7564 7595 7665 7686 7770 7812 7884 8029 8103 8235 8370 8540 8820 8906 8937 8967 9028 9052 9065 9114 9198 9268 9324 9455 9765 9855 9930 9990 10220 10261 10323 10731 10804 10878 10980 11285 11315 11346 11470 11529 11585 11655 11718 11916 11956 12247 12810 13020 13140 13230 13237 13359 13505 13542 13578 13671 13764 13797 13902 13986 14308 14895 14945 15190 15330 15372 15540 15799 15841 16058 16206 16219 16317 16470 16740 17019 17205 17812 17874 17885 17934 18130 18228 18396 18907 18910 19215 19530 19710 19860 19980 20191 20313 20367 20522 20646 20853 21462 21756 22265 22570 22630 22692 22785 22940 22995 23058 23170 23310 23436 24087 24163 24309 24494 25620 26460 26474 26718 26901 27010 27084 27156 27195 27342 27594 27804 27972 28365 29295 29790 29890 30380 30660 30783 30969 31171 31598 31682 32116 32193 32412 32438 32634 32940 33855 33945 34038 34410 34755 34965 35748 35770 35868 36260 36741 37814 37820 38430 39060 39420 39711 40077 40145 40382 40515 40626 40734 41013 41044 41292 41706 42924 44530 44685 44835 45140 45260 45570 45990 46116 46340 46620 47397 47523 48174 48326 48618 48657 48951 48988 51057 51305 51615 52948 53436 53655 53802 54020 54390 54684 55188 56203 56721 56730 57645 58590 59580 59780 60573 60939 61101 61235 61566 61938 62342 62559 63196 63364 64386 64876 65268 66185 66795 67710 67890 68076 68355 68820 68985 69510 69930 69967 71540 71827 72261 72489 72927 73482 75628 76860 78995 79205 79422 80154 80290 80703 80764 81030 81095 81252 81468 81585 82026 83412 83731 85095 85729 89060 89370 89670 91140 91980 92349 92659 93513 94535 94794 95046 96348 96579 96652 97236 97314 97902 100955 101565 101835 102114 102610 103230 104265 107310 107604 108780 110223 110593 110887 112406 113442 113460 115290 117180 119133 120231 120435 120815 121146 121545 121878 122202 122470 123132 123876 124684 125118 128772 132349 132370 133590 134505 135420 135780 136710 137970 138043 139020 139860 139934 141337 142191 142569 143654 144522 144978 145854 145971 146964 153915 154845 155855 157990 158410 158844 160308 160580 160965 161406 162060 162190 163170 164052 164761 167462 168609 169141 170163 170190 171458 178740 179340 181719 183705 184698 185318 187026 189070 189588 190092 193158 194628 195804 198555 200385 201910 203130 203670 204228 205065 205220 206460 208530 209901 214620 215481 216783 217467 218197 220446 221186 221774 224812 226884 230580 236985 237615 238266 240462 240870 241630 242292 243090 243285 243756 244404 244755 244940 250236 251193 255285 257187 264698 264740 267180 269010 273420 275940 276086 277047 277977 279868 280539 281015 282674 283605 284382 285138 287308 289044 289956 291708 291942 302865 304695 305505 307830 309690 311710 312795 315980 316820 321930 322812 324380 326340 329522 330669 331779 332661 334924 337218 338282 340326 340380 342916 349835 357399 359135 361305 362445 363438 364635 367410 369396 370636 374052 378140 379657 386316 397047 397110 400770 403515 403820 406260 407340 410130 414129 417060 418655 419802 424011 426573 427707 428645 430962 433566 434934 436394 437913 440892 442372 443548 461745 463295 467565 473970 475230 476532 480924 481740 482895 483260 486180 486570 489510 489769 494283 502386 502789 505827 507423 510489 510570 514374 529396 538020 545157 551115 552172 552965 554094 554435 555954 561078 562030 565348 567210 568764 570276 583884 586117 595665 600103 601155 605730 609390 611010 615660 619380 623420 625590 625921 629703 643860 646443 652401 654591 659044 661338 661745 663558 665322 674436 676564 680652 690215 699670 706685 710955 712845 714798 718270 722610 724890 726876 729270 729855 734820 747067 749053 753579 759314 771561 794094 794220 801540 807030 820260 823805 828258 833931 837310 839604 841617 843045 845705 848022 850815 853146 855414 857290 861924 867132 869868 872788 875826 894031 908595 923490 926590 935130 947940 950460 965790 966301 973140 979020 979538 988566 989359 995337 997983 1004772 1005578 1011654 1014846 1020978 1021140 1028748 1049505 1077405 1083915 1087335 1090314 1090985 1102230 1105930 1108188 1108870 1111908 1122156 1124060 1134420 1138971 1153327 1172234 1183987 1191141 1191330 1200206 1202310 1211460 1218780 1222020 1242387 1251180 1251842 1255965 1259406 1272033 1285935 1292886 1304802 1309182 1322676 1323490 1327116 1330644 1380430 1385235 1389885 1399340 1402695 1413370 1421910 1425690 1429596 1436540 1445220 1449780 1458540 1459710 1469307 1473943 1482849 1494134 1498106 1507158 1508367 1517481 1518628 1522269 1543122 1588188 1614060 1647610 1653345 1656516 1658895 1663305 1667862 1674620 1683234 1686090 1691410 1696044 1701630 1706292 1710828 1714580 1751652 1758351 1786995 1788062 1800309 1817190 1846980 1853180 1870260 1877763 1889109 1898285 1931580 1932602 1939329 1959076 1963773 1977132 1978718 1985235 1990674 1995966 2011156 2023308 2029692 2041956 2070645 2099010 2120055 2132865 2138535 2154810 2167830 2174670 2180628 2181970 2189565 2204460 2211860 2217740 2241201 2247159 2260737 2277942 2306654 2314683 2344468 2367974 2382282 2382660 2400412 2404620 2448845 2471415 2484774 2501793 2503684 2511930 2513945 2518812 2529135 2537115 2544066 2552445 2571870 2585772 2609604 2618364 2646980 2657599 2682093 2725785 2760860 2770470 2779770 2805390 2826740 2843820 2851380 2898903 2919420 2930585 2938614 2947886 2965698 2968077 2986011 2988268 2993949 2996212 3000515 3014316 3016734 3034962 3044538 3086244 3129605 3148515 3232215 3262005 3272955 3295220 3306690 3317790 3326610 3335724 3366468 3372180 3382820 3403260 3416913 3428383 3459981 3516702 3551961 3573423 3573990 3576124 3600618 3634380 3727161 3735335 3745265 3755526 3767895 3778218 3796570 3816099 3857805 3865204 3878658 3927546 3957436 3970470 3981348 3991932 4102819 4141290 4169655 4198020 4208085 4240110 4265730 4277070 4309620 4335660 4349340 4363940 4379130 4381447 4407921 4421829 4448547 4470155 4482402 4494318 4521474 4525101 4555884 4566807 4613308 4629366 4735948 4764564 4831505 4897690 4942830 4946795 4969548 4976685 4989915 5003586 5023860 5027890 5058270 5074230 5088132 5104890 5107591 5143740 5229469 5243371 5275053 5315198 5364186 5400927 5451570 5540940 5559540 5610780 5633289 5694855 5766635 5797806 5861170 5877228 5891319 5895772 5919935 5931396 5936154 5955705 5972022 5987898 6001030 6033468 6069924 6089076 6211935 6258217 6259210 6297030 6360165 6464430 6524010 6545910 6613380 6635580 6653220 6723603 6741477 6764107 6833826 6856766 6919962 7033404 7103922 7146846 7147980 7201236 7346535 7369715 7414245 7454322 7470670 7490530 7511052 7535790 7541835 7556436 7587405 7593140 7611345 7632198 7715610 7757316 7855092 7940940 7972797 8046279 8073289 8205638 8282580 8339310 8416170 8480220 8531460 8554140 8696709 8758260 8762894 8791755 8815842 8843658 8897094 8904231 8940310 8964804 8988636 9001545 9042948 9050202 9133614 9258732 9388815 9445545 9663010 9696645 9795380 9818865 9885660 9893590 9953370 9979830 10007172 10055780 10116540 10148460 10209780 10215182 10250739 10285149 10317601 10379943 10458938 10486742 10550106 10630396 10655883 10728372 10801854 10903140 11206005 11235795 11266578 11303685 11389710 11533270 11573415 11595612 11722340 11782638 11839870 11872308 11911410 11944044 11975796 12002060 12308457 12423870 12508965 12516434 12518420 12594060 12720330 12928860 13048020 13091820 13144341 13223763 13265487 13287995 13410465 13447206 13482954 13528214 13575303 13667652 13713532 13839924 14207844 14293692 14494515 14693070 14739430 14828490 14840385 14908644 14930055 14941340 14969745 14981060 15071580 15083670 15174810 15222690 15264396 15322773 15431220 15688407 15730113 15825159 15945594 16092558 16146578 16202781 16411276 16678620 16832340 16899867 17084565 17141915 17299905 17393418 17525788 17583510 17631684 17687316 17759805 17794188 17808462 17867115 17880620 18003090 18100404 18267228 18603193 18635805 18774651 18777630 18891090 19080495 19326020 19393290 19637730 19787180 19906740 19959660 20170809 20224431 20292321 20430364 20501478 20514095 20570298 20635202 20759886 20917876 20973484 21100212 21311766 21603708 21907235 22039605 22109145 22242735 22412010 22471590 22533156 22607370 22625505 22779420 22834035 23066540 23146830 23159077 23565276 23679740 23822820 23918391 24138837 24219867 24616914 24847740 25017930 25032868 25440660 25537955 26090127 26147345 26216855 26288682 26375265 26447526 26530974 26575990 26712693 26820930 26894412 26965908 27004635 27056428 27150606 27714961 28166445 28989030 29386140 29456595 29478860 29656980 29680770 29860110 29939490 30167340 30349620 30445380 30645546 30670129 30855447 30952803 31139829 31291085 31376814 31460226 31650318 31891188 31967649 32185116 32293156 32405562 33618015 33707385 33799734 33820535 34169130 34283830 34599810 34786836 35167020 35519610 35616924 35734230 35753137 36006180 36606283 36703597 36925371 37206386 37271610 37549302 37555260 37782180 38160990 38786580 39275460 39433023 39796461 39863985 40231395 40341618 40366445 40448862 40584642 41002956 41028190 41140596 41270404 41519772 42623532 43483545 43807519 43814470 44079210 44218290 44485470 44521155 44824020 44943180 45214740 45251010 45668070 45692233 45968319 46293660 46318154 47065221 47190339 47836782 48277674 48439734 49233828 50035860 51075910 51253695 51425745 51588005 51899715 52180254 52294690 52433710 52577364 52750530 52895052 53061948 53151980 53279415 53425386 53641860 54009270 54301212 54535891 55429922 55809579 56323953 56332890 57978060 58913190 59361540 59720220 59878980 60876963 61291092 61340258 61542285 61710894 61905606 62279658 62582170 62753628 62920452 63300636 63935298 64811124 65721705 66118815 66327435 67236030 67414770 67599468 67641070 67876515 68338260 68567660 69199620 69477231 71039220 71468460 71506274 71755173 72223207 72659601 73212566 73407194 73850742 74412772 74543220 75098604 76321980 76613865 78442035 78650565 78866046 79125795 79592922 79727970 80462790 80683236 80732890 80897724 81013905 81169284 82056380 83144883 84499335 86967090 87615038 87628940 88158420 88436580 88970940 89042310 90502020 91336140 91384466 91936638 92010387 92566341 92636308 92858409 93015965 93873255 94130442 94380678 95673564 96555348 96879468 100854045 101122155 101461605 102151820 102507390 102851490 103176010 103799430 104360508 104589380 104867420 105501060 106558830 106850772 107259411 108018540 109071782 109818849 110110791 110776113 110859844 111619158 112647906 112665780 115795385 117826380 118299069 119591955 120694185 121099335 121753926 122680516 123084570 123421788 123811212 124559316 125164340 127870596 130450635 131422557 131443410 132237630 132654870 133563465 134472060 134829540 135282140 135753030 137076699 137904957 138574805 138954462 141195663 141571017 143012548 143510346 144446414 145319202 146425132 146814388 147701484 153227730 153350645 154277235 154764015 155699145 156884070 157301130 157732092 158251590 159185844 159455940 159838245 160925580 161465780 162027810 162113539 163607673 166289766 167428737 168971859 168998670 173934180 175230076 178084620 178765685 182630889 182768932 183031415 183517985 183873276 184020774 184626855 185132682 185716818 186031930 187746510 188260884 188761356 194004727 197165115 198982305 201708090 202244310 202923210 205014780 205702980 206352020 207598860 208431693 213117660 214518822 216669621 217978803 218143564 219037595 219637698 220221582 221552226 223238316 225295812 228461165 229841595 231590770 235326105 235951695 236598138 239183910 241388370 242198670 243507852 246169140 249434649 250271959 260901270 262845114 262886820 264475260 265309740 267126930 271506060 272679455 274153398 275809914 276031161 277149610 277908924 278575227 279047895 281619765 282391326 283142034 287020692 288892828 290638404 304384815 306455460 306701290 308554470 309528030 311398290 313768140 314602260 316503180 319676490 319845631 321778233 324055620 324227078 327215346 329456547 330332373 332579532 334857474 337943718 337997340 347386155 357531370 358775865 361116035 363298005 365261778 366062830 367035970 368041548 369253710 370265364 371433636 372063860 375493020 381751237 388009454 394267671 394330230 397964610 403416180 404488620 405846420 411230097 415724415 416863386 429037644 433339242 435957606 438075190 439275396 440443164 443104452 456922330 459683190 460051935 462831705 463181540 464292045 470652210 471903390 473196276 478367820 482776740 484397340 486340617 490823019 498869298 500543918 502286211 521802540 525690228 534253860 536297055 545358910 548306796 549094245 550553955 551619828 552062322 553880565 554299220 557150454 558095790 563239530 564782652 566284068 582014181 591495345 608769630 613402580 617108940 619056060 622796580 625295079 639352980 639691262 643556466 648454156 650008863 654430692 657112785 658913094 660664746 669714948 675887436 685383495 689524785 694772310 705978315 707855085 715062740 717551730 722232070 726596010 730523556 732125660 734071940 738507420 748303947 750815877 763502474 776018908 788535342 788660460 795929220 810567695 818038365 822460194 828093483 831448830 833726772 837143685 844859295 866678484 871915212 876150380 913154445 913844660 919366380 920103870 925663410 928584090 941304420 943806780 959536893 965334699 970023635 972681234 981646038 988369641 990997119 997738596 1001087836 1004572422 1042158465 1072594110 1083348105 1089894015 1090717820 1098188490 1101107910 1104124644 1107761130 1114300908 1116191580 1126479060 1134794773 1145253711 1164028362 1182803013 1182990690 1217539260 1233690291 1247173245 1250590158 1251359795 1279382524 1287112932 1300017726 1314225570 1317826188 1321329492 1358033089 1370766990 1379049570 1380155805 1389544620 1392876135 1411956630 1415710170 1435103460 1444464140 1453192020 1459021851 1472469057 1496607894 1501631754 1527004948 1577070684 1599228155 1608891165 1621135390 1636076730 1644920388 1647282735 1651661865 1656186966 1662897660 1674287370 1689718590 1690612621 1746042543 1826308890 1840207740 1851326820 1857168180 1908756185 1919073786 1930669398 1940047270 1945362468 1950026589 1963292076 1971338355 1976739282 1981994238 2009144844 2056150485 2084316930 2145188220 2166696210 2179788030 2196376980 2202215820 2215522260 2238919417 2252447631 2269589546 2290507422 2328056724 2365606026 2365981380 2431703085 2454115095 2467380582 2494346490 2501180316 2502719590 2511431055 2600035452 2628451140 2672258659 2716066178 2741533980 2758099140 2760311610 2785752270 2823913260 2831420340 2878610679 2910070905 2918043702 2944938114 2993215788 3003263508 3126475395 3198456310 3217782330 3242270780 3250044315 3272153460 3294565470 3303323730 3312373932 3348574740 3379437180 3381225242 3404384319 3435761133 3492085086 3652617780 3741519735 3754079385 3817512370 3838147572 3861338796 3880094540 3900053178 3942676710 3953478564 3963988476 4074099267 4112300970 4140467415 4168633860 4333392420 4359576060 4377065553 4477838834 4504895262 4539179092 4581014844 4731212052 4797684465 4826673495 4863406170 4908230190 4934761164 4941848205 4954985595 4988692980 5005439180 5022862110 5071837863 5238127629 5344517318 5432132356 5520623220 5571504540 5673973865 5726268555 5757221358 5820141810 5836087404 5889876228 5914015065 6168451455 6252950790 6396912620 6435564660 6500088630 6589130940 6606647460 6716758251 6757342893 6762450484 6790165445 6808768638 6871522266 6984170172 7295109255 7362345285 7483039470 7508158770 7635024740 7800106356 7885353420 8016775977 8148198534 8224601940 8280934830 8453063105 8635832037 8730212715 8754131106 8955677668 9009790524 9595368930 9653346990 9726812340 9750132945 9816460380 9883696410 9909971190 10045724220 10143675726 10213152957 10307283399 10476255258 10689034636 11194597085 11262238155 11347947730 11452537110 11514442716 11640283620 11828030130 11834288347 12222297801 12336902910 12505901580 13000177260 13361293295 13433516502 13514685786 13580330890 13617537276 13743044532 14393053395 14590218510 14724690570 14966078940 15016317540 15215513589 16033551954 16296397068 16561869660 16906126210 17021921595 17178805665 17271664074 17460425430 17508262212 19190737860 19306693980 19500265890 19767392820 19819942380 20150274753 20287351452 20370496335 20426305914 20614566798 20952510516 21885327765 22389194170 22524476310 22695895460 22905074220 23656060260 23668576694 24050327931 24444595602 24673805820 25359189315 26190638145 26722586590 26867033004 27029371572 27160661780 28786106790 29180437020 29449381140 30431027178 30639458871 32067103908 33583791255 33786714465 33812252420 34043843190 34357611330 34543328148 34920850860 35502865041 36666893403 39000531780 40083879885 40300549506 40740992670 40852611828 41229133596 43179160185 43770655530 44778388340 45048952620 45646540767 47337153388 48100655862 48889191204 50718378630 51065764785 51536416995 52381276290 53445173180 57572213580 59171441735 60450824259 60862054356 61111489005 61278917742 67167582510 67573428930 68087686380 68715222660 71005730082 72150983793 73333786806 76077567945 80167759770 80601099012 81481985340 82840018429 86358320370 87541311060 91293081534 96201311724 100751373765 101436757260 102131529570 103072833990 104762552580 106508595123 118342883470 120251639655 120901648518 122222978010 122557835484 134335165020 135146857860 142011460164 144301967586 146667573612 152155135890 153197294355 160335519540 165680036858 172716640740 177514325205 182586163068 183334467015 201502747530 204263059140 206145667980 213017190246 228232703835 236685766940 240503279310 241803297036 244445956020 248520055287 288603935172 302254121295 304310271780 306394588710 319525785369 331360073716 355028650410 360754918965 366668934030 403005495060 414200092145 426034380492 456465407670 481006558620 497040110574 532542975615 604508242590 612789177420 639051570738 710057300820 721509837930 733337868060 745560165861 828400184290 912930815340 994080221148 1065085951230 1209016485180 1242600276435 1278103141476 1443019675860 1491120331722 1597628926845 1656800368580 2130171902460 2236680497583 2485200552870 2982240663444 3195257853690 3727800829305 4473360995166 4970401105740 6390515707380 7455601658610 8946721990332 11183402487915 14911203317220 22366804975830 44733609951660
- Sum of all divisors σ(n): 177369607618560
- Sum of proper divisors (its aliquot sum) s(n): 132635997666900
- 44733609951660 is an abundant number, because the sum of its proper divisors (132635997666900) is greater than itself. Its abundance is 87902387715240
Bases of 44733609951660
- Binary: 10100010101111010110101110111001000001101011002
- Hexadecimal: 0x28AF5AEE41AC
- Base-36: FUUC4DLF0
Squares and roots of 44733609951660
- 44733609951660 squared (447336099516602) is 2001095859307254587536755600
- 44733609951660 cubed (447336099516603) is 89516241646132623050667398914189234296000
-
The
square root of 44733609951660 is 6688318.9182080725 -
The
cube root of 44733609951660 is 35498.6073517449
Scales and comparisons
How big is 44733609951660?- 44,733,609,951,660 seconds is equal to 1,422,390 years, 22 weeks, 1 day, 4 hours, 21 minutes.
-
To count from 1 to 44,733,609,951,660 would take you about three million, five hundred fifty-five thousand, nine hundred seventy-six 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 44733609951660 cubic inches would be around 2958.2 feet tall.
Recreational maths with 44733609951660
- 44733609951660 backwards is 06615990633744
- 44733609951660 is a
Harshad number . - The number of decimal digits it has is: 14
- The sum of 44733609951660's digits is 63
- 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 44733609951660 - Facts about the integer". Numbermatics.com. 2024. Web. 24 June 2024.
APA style:
Numbermatics. (2024). Number 44733609951660 - Facts about the integer. Retrieved 24 June 2024, from https://numbermatics.com/n/44733609951660/
Chicago style:
Numbermatics. 2024. "Number 44733609951660 - Facts about the integer". https://numbermatics.com/n/44733609951660/
The information we have on file for 44733609951660 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 44733609951660, math, Factors of 44733609951660, curriculum, school, college, exams, university, Prime factorization of 44733609951660, STEM, science, technology, engineering, physics, economics, calculator, forty-four trillion, seven hundred thirty-three billion, six hundred nine million, nine hundred fifty-one thousand, six hundred sixty.