128439920
128,439,920 is an even composite number composed of five prime numbers multiplied together.
128439920 is an even composite number. It is composed of five distinct prime numbers multiplied together. It has a total of eighty divisors.
Prime factorization of 128439920:
24 × 5 × 7 × 211 × 1087
(2 × 2 × 2 × 2 × 5 × 7 × 211 × 1087)See below for interesting mathematical facts about the number 128439920 from the Numbermatics database.
Names of 128439920
- Cardinal: 128439920 can be written as One hundred twenty-eight million, four hundred thirty-nine thousand, nine hundred twenty.
Scientific notation
- Scientific notation: 1.2843992 × 108
Factors of 128439920
Divisors of 128439920
- Number of divisors d(n): 80
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Complete list of divisors:
1 2 4 5 7 8 10 14 16 20 28 35 40 56 70 80 112 140 211 280 422 560 844 1055 1087 1477 1688 2110 2174 2954 3376 4220 4348 5435 5908 7385 7609 8440 8696 10870 11816 14770 15218 16880 17392 21740 23632 29540 30436 38045 43480 59080 60872 76090 86960 118160 121744 152180 229357 304360 458714 608720 917428 1146785 1605499 1834856 2293570 3210998 3669712 4587140 6421996 8027495 9174280 12843992 16054990 18348560 25687984 32109980 64219960 128439920
- Sum of all divisors σ(n): 343216128
- Sum of proper divisors (its aliquot sum) s(n): 214776208
- 128439920 is an abundant number, because the sum of its proper divisors (214776208) is greater than itself. Its abundance is 86336288
Bases of 128439920
- Binary: 1111010011111010110011100002
- Hexadecimal: 0x7A7D670
- Base-36: 24GWVK
Squares and roots of 128439920
- 128439920 squared (1284399202) is 16496813049606400
- 128439920 cubed (1284399203) is 2118849348346402047488000
-
The
square root of 128439920 is 11333.1337237323 -
The
cube root of 128439920 is 504.5451186025
Scales and comparisons
How big is 128439920?- 128,439,920 seconds is equal to 4 years, 4 weeks, 2 days, 13 hours, 45 minutes, 20 seconds.
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To count from 1 to 128,439,920 would take you about 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 128439920 cubic inches would be around 42 feet tall.
Recreational maths with 128439920
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