81355140
81,355,140 is an even composite number composed of six prime numbers multiplied together.
81355140 is an even composite number. It is composed of six distinct prime numbers multiplied together. It has a total of one hundred forty-four divisors.
Prime factorization of 81355140:
22 × 32 × 5 × 23 × 43 × 457
(2 × 2 × 3 × 3 × 5 × 23 × 43 × 457)See below for interesting mathematical facts about the number 81355140 from the Numbermatics database.
Names of 81355140
- Cardinal: 81355140 can be written as Eighty-one million, three hundred fifty-five thousand, one hundred forty.
Scientific notation
- Scientific notation: 8.135514 × 107
Factors of 81355140
Divisors of 81355140
- Number of divisors d(n): 144
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Complete list of divisors:
1 2 3 4 5 6 9 10 12 15 18 20 23 30 36 43 45 46 60 69 86 90 92 115 129 138 172 180 207 215 230 258 276 345 387 414 430 457 460 516 645 690 774 828 860 914 989 1035 1290 1371 1380 1548 1828 1935 1978 2070 2285 2580 2742 2967 3870 3956 4113 4140 4570 4945 5484 5934 6855 7740 8226 8901 9140 9890 10511 11868 13710 14835 16452 17802 19651 19780 20565 21022 27420 29670 31533 35604 39302 41130 42044 44505 52555 58953 59340 63066 78604 82260 89010 94599 98255 105110 117906 126132 157665 176859 178020 189198 196510 210220 235812 294765 315330 353718 378396 393020 451973 472995 589530 630660 707436 884295 903946 945990 1179060 1355919 1768590 1807892 1891980 2259865 2711838 3537180 4067757 4519730 5423676 6779595 8135514 9039460 13559190 16271028 20338785 27118380 40677570 81355140
- Sum of all divisors σ(n): 264071808
- Sum of proper divisors (its aliquot sum) s(n): 182716668
- 81355140 is an abundant number, because the sum of its proper divisors (182716668) is greater than itself. Its abundance is 101361528
Bases of 81355140
- Binary: 1001101100101100001100001002
- Hexadecimal: 0x4D96184
- Base-36: 1CFQ10
Squares and roots of 81355140
- 81355140 squared (813551402) is 6618658804419600
- 81355140 cubed (813551403) is 538461913645789176744000
-
The
square root of 81355140 is 9019.7084210079 -
The
cube root of 81355140 is 433.3062954859
Scales and comparisons
How big is 81355140?- 81,355,140 seconds is equal to 2 years, 30 weeks, 3 days, 14 hours, 39 minutes.
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To count from 1 to 81,355,140 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 81355140 cubic inches would be around 36.1 feet tall.
Recreational maths with 81355140
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