81520400
81,520,400 is an even composite number composed of five prime numbers multiplied together.
81520400 is an even composite number. It is composed of five distinct prime numbers multiplied together. It has a total of one hundred twenty divisors.
Prime factorization of 81520400:
24 × 52 × 13 × 61 × 257
(2 × 2 × 2 × 2 × 5 × 5 × 13 × 61 × 257)See below for interesting mathematical facts about the number 81520400 from the Numbermatics database.
Names of 81520400
- Cardinal: 81520400 can be written as Eighty-one million, five hundred twenty thousand, four hundred.
Scientific notation
- Scientific notation: 8.15204 × 107
Factors of 81520400
Divisors of 81520400
- Number of divisors d(n): 120
-
Complete list of divisors:
1 2 4 5 8 10 13 16 20 25 26 40 50 52 61 65 80 100 104 122 130 200 208 244 257 260 305 325 400 488 514 520 610 650 793 976 1028 1040 1220 1285 1300 1525 1586 2056 2440 2570 2600 3050 3172 3341 3965 4112 4880 5140 5200 6100 6344 6425 6682 7930 10280 12200 12688 12850 13364 15677 15860 16705 19825 20560 24400 25700 26728 31354 31720 33410 39650 51400 53456 62708 63440 66820 78385 79300 83525 102800 125416 133640 156770 158600 167050 203801 250832 267280 313540 317200 334100 391925 407602 627080 668200 783850 815204 1019005 1254160 1336400 1567700 1630408 2038010 3135400 3260816 4076020 5095025 6270800 8152040 10190050 16304080 20380100 40760200 81520400
- Sum of all divisors σ(n): 215210184
- Sum of proper divisors (its aliquot sum) s(n): 133689784
- 81520400 is an abundant number, because the sum of its proper divisors (133689784) is greater than itself. Its abundance is 52169384
Bases of 81520400
- Binary: 1001101101111100111000100002
- Hexadecimal: 0x4DBE710
- Base-36: 1CJ9JK
Squares and roots of 81520400
- 81520400 squared (815204002) is 6645575616160000
- 81520400 cubed (815204003) is 541749982459609664000000
-
The
square root of 81520400 is 9028.8648234427 -
The
cube root of 81520400 is 433.5994946051
Scales and comparisons
How big is 81520400?- 81,520,400 seconds is equal to 2 years, 30 weeks, 5 days, 12 hours, 33 minutes, 20 seconds.
-
To count from 1 to 81,520,400 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 81520400 cubic inches would be around 36.1 feet tall.
Recreational maths with 81520400
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The information we have on file for 81520400 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!
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