81350720
81,350,720 is an even composite number composed of four prime numbers multiplied together.
81350720 is an even composite number. It is composed of four distinct prime numbers multiplied together. It has a total of one hundred twelve divisors.
Prime factorization of 81350720:
26 × 5 × 113 × 191
(2 × 2 × 2 × 2 × 2 × 2 × 5 × 11 × 11 × 11 × 191)See below for interesting mathematical facts about the number 81350720 from the Numbermatics database.
Names of 81350720
- Cardinal: 81350720 can be written as Eighty-one million, three hundred fifty thousand, seven hundred twenty.
Scientific notation
- Scientific notation: 8.135072 × 107
Factors of 81350720
Divisors of 81350720
- Number of divisors d(n): 112
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Complete list of divisors:
1 2 4 5 8 10 11 16 20 22 32 40 44 55 64 80 88 110 121 160 176 191 220 242 320 352 382 440 484 605 704 764 880 955 968 1210 1331 1528 1760 1910 1936 2101 2420 2662 3056 3520 3820 3872 4202 4840 5324 6112 6655 7640 7744 8404 9680 10505 10648 12224 13310 15280 16808 19360 21010 21296 23111 26620 30560 33616 38720 42020 42592 46222 53240 61120 67232 84040 85184 92444 106480 115555 134464 168080 184888 212960 231110 254221 336160 369776 425920 462220 508442 672320 739552 924440 1016884 1271105 1479104 1848880 2033768 2542210 3697760 4067536 5084420 7395520 8135072 10168840 16270144 20337680 40675360 81350720
- Sum of all divisors σ(n): 214189056
- Sum of proper divisors (its aliquot sum) s(n): 132838336
- 81350720 is an abundant number, because the sum of its proper divisors (132838336) is greater than itself. Its abundance is 51487616
Bases of 81350720
- Binary: 1001101100101010000010000002
- Hexadecimal: 0x4D95040
- Base-36: 1CFMM8
Squares and roots of 81350720
- 81350720 squared (813507202) is 6617939644518400
- 81350720 cubed (813507203) is 538374154998115893248000
-
The
square root of 81350720 is 9019.4633986727 -
The
cube root of 81350720 is 433.2984482107
Scales and comparisons
How big is 81350720?- 81,350,720 seconds is equal to 2 years, 30 weeks, 3 days, 13 hours, 25 minutes, 20 seconds.
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To count from 1 to 81,350,720 would take you about three 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 81350720 cubic inches would be around 36.1 feet tall.
Recreational maths with 81350720
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