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# Factorial n! calculator, convert

 !, Factorial (10)= 3628800
What is factorial? What is that operation? Factorial n means 1 * 2 * 3 * 4 * ... * n. It means that starting from n you multiply by every number that is once smaller than it to one. Then you stop. For example 5 factorial: 5! is equal to 1 * 2 * 3 * 4 * 5 = 120. So it is big number. Power of factorial is increasing enormously, and 100 is equal to 9.332621544E+157. They grow very fast. So it is very big distance from 5! and 100!. High level factorials end with zero every time, because it was multiplication by 5 and by 2.
Next factorial from previous differs in such way: n! = n * (n-1)!. So 6! = 6 * 5! = 6 * 120 = 720. 7! factorial will be 7 * 6! and so on. 0! is equivalent to 1. This is one exception. Factorials are used in combinatorics and probability theory mostly.

Examples and formulas:
2! + 3! is not equal to 5!. Using above formula 2! + 3! = ( 1 * 2! + 3 * 2!) = 2! ( 1 + 3) = 8
2! * 4! is not equal to 8!. In similar way as above 2! * 4! = ( 1 * 2! * 4 * 3 * 2!) = 2! * 2! ( 1 * 4 * 3 ) = 48

#### Factorials from 1 to 100

 1 = 1 26 = 4.032914611E+26 51 = 1.551118753E+66 76 = 1.885494702E+111 2 = 2 27 = 1.088886945E+28 52 = 8.065817517E+67 77 = 1.45183092E+113 3 = 6 28 = 3.048883446E+29 53 = 4.274883284E+69 78 = 1.132428118E+115 4 = 24 29 = 8.841761994E+30 54 = 2.308436973E+71 79 = 8.946182131E+116 5 = 120 30 = 2.652528598E+32 55 = 1.269640335E+73 80 = 7.156945705E+118 6 = 720 31 = 8.222838654E+33 56 = 7.109985878E+74 81 = 5.797126021E+120 7 = 5040 32 = 2.631308369E+35 57 = 4.05269195E+76 82 = 4.753643337E+122 8 = 40320 33 = 8.683317619E+36 58 = 2.350561331E+78 83 = 3.94552397E+124 9 = 362880 34 = 2.95232799E+38 59 = 1.386831185E+80 84 = 3.314240135E+126 10 = 3628800 35 = 1.033314797E+40 60 = 8.320987113E+81 85 = 2.817104114E+128 11 = 39916800 36 = 3.719933268E+41 61 = 5.075802139E+83 86 = 2.422709538E+130 12 = 479001600 37 = 1.376375309E+43 62 = 3.146997326E+85 87 = 2.107757298E+132 13 = 6227020800 38 = 5.230226175E+44 63 = 1.982608315E+87 88 = 1.854826423E+134 14 = 8.71782912E+10 39 = 2.039788208E+46 64 = 1.268869322E+89 89 = 1.650795516E+136 15 = 1.307674368E+12 40 = 8.159152832E+47 65 = 8.247650592E+90 90 = 1.485715964E+138 16 = 2.092278989E+13 41 = 3.345252661E+49 66 = 5.443449391E+92 91 = 1.352001528E+140 17 = 3.556874281E+14 42 = 1.405006118E+51 67 = 3.647111092E+94 92 = 1.243841405E+142 18 = 6.402373706E+15 43 = 6.041526306E+52 68 = 2.480035542E+96 93 = 1.156772507E+144 19 = 1.216451004E+17 44 = 2.658271575E+54 69 = 1.711224524E+98 94 = 1.087366157E+146 20 = 2.432902008E+18 45 = 1.196222209E+56 70 = 1.197857167E+100 95 = 1.032997849E+148 21 = 5.109094217E+19 46 = 5.50262216E+57 71 = 8.504785886E+101 96 = 9.916779349E+149 22 = 1.124000728E+21 47 = 2.586232415E+59 72 = 6.123445838E+103 97 = 9.619275968E+151 23 = 2.585201674E+22 48 = 1.241391559E+61 73 = 4.470115462E+105 98 = 9.426890449E+153 24 = 6.204484017E+23 49 = 6.08281864E+62 74 = 3.307885442E+107 99 = 9.332621544E+155 25 = 1.551121004E+25 50 = 3.04140932E+64 75 = 2.480914081E+109 100 = 9.332621544E+157