128521728

Names of 128521728

• Cardinal: 128521728 can be written as One hundred twenty-eight million, five hundred twenty-one thousand, seven hundred twenty-eight.

Scientific notation

• Scientific notation: 1.28521728 × 10⁸

Factors of 128521728

• Number of distinct prime factors ω(n): 3
• Total number of prime factors Ω(n): 15
• Sum of prime factors: 1038

Divisors of 128521728

• Number of divisors d(n): 120
• Complete list of divisors:
  1 2 3 4 6 8 9 12 16 18 24 27 32 36 48 54 64 72 81 96 108 128 144 162 192 216 243 256 288 324 384 432 486 512 576 648 768 864 972 1033 1152 1296 1536 1728 1944 2066 2304 2592 3099 3456 3888 4132 4608 5184 6198 6912 7776 8264 9297 10368 12396 13824 15552 16528 18594 20736 24792 27891 31104 33056 37188 41472 49584 55782 62208 66112 74376 83673 99168 111564 124416 132224 148752 167346 198336 223128 251019 264448 297504 334692 396672 446256 502038 528896 595008 669384 793344 892512 1004076 1190016 1338768 1586688 1785024 2008152 2380032 2677536 3570048 4016304 4760064 5355072 7140096 8032608 10710144 14280192 16065216 21420288 32130432 42840576 64260864 128521728
• Sum of all divisors σ(n): 385032648
• Sum of proper divisors (its aliquot sum) s(n): 256510920
• 128521728 is an abundant number, because the sum of its proper divisors (256510920) is greater than itself. Its abundance is 127989192

Bases of 128521728

• Binary: 111101010010001011000000000₂
• Hexadecimal: 0x7A91600
• Base-36: 24IO00

Squares and roots of 128521728

• 128521728 squared (128521728²) is 16517834568105984
• 128521728 cubed (128521728³) is 2122900641511114750820352
• The square root of 128521728 is 11336.7423892403
• The cube root of 128521728 is 504.6522168389

Scales and comparisons

• 128,521,728 seconds is equal to 4 years, 4 weeks, 3 days, 12 hours, 28 minutes, 48 seconds.
• To count from 1 to 128,521,728 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 128521728 cubic inches would be around 42.1 feet tall.

Recreational maths with 128521728

• 128521728 backwards is 827125821
• 128521728 is a Harshad number.
• The number of decimal digits it has is: 9
• The sum of 128521728's digits is 36
• More coming soon!