1388206728

Names of 1388206728

• Cardinal: 1388206728 can be written as One billion, three hundred eighty-eight million, two hundred six thousand, seven hundred twenty-eight.

Scientific notation

• Scientific notation: 1.388206728 × 10⁹

Factors of 1388206728

• Number of distinct prime factors ω(n): 4
• Total number of prime factors Ω(n): 10
• Sum of prime factors: 961

Divisors of 1388206728

• Number of divisors d(n): 128
• Complete list of divisors:
  1 2 3 4 6 8 9 12 18 19 24 27 36 38 54 57 72 76 108 114 152 171 216 228 342 361 456 513 684 722 937 1026 1083 1368 1444 1874 2052 2166 2811 2888 3249 3748 4104 4332 5622 6498 6859 7496 8433 8664 9747 11244 12996 13718 16866 17803 19494 20577 22488 25299 25992 27436 33732 35606 38988 41154 50598 53409 54872 61731 67464 71212 77976 82308 101196 106818 123462 142424 160227 164616 185193 202392 213636 246924 320454 338257 370386 427272 480681 493848 640908 676514 740772 961362 1014771 1281816 1353028 1481544 1922724 2029542 2706056 3044313 3845448 4059084 6088626 6426883 8118168 9132939 12177252 12853766 18265878 19280649 24354504 25707532 36531756 38561298 51415064 57841947 73063512 77122596 115683894 154245192 173525841 231367788 347051682 462735576 694103364 1388206728
• Sum of all divisors σ(n): 4074672000
• Sum of proper divisors (its aliquot sum) s(n): 2686465272
• 1388206728 is an abundant number, because the sum of its proper divisors (2686465272) is greater than itself. Its abundance is 1298258544

Bases of 1388206728

• Binary: 1010010101111100101101010001000₂
• Hexadecimal: 0x52BE5A88
• Base-36: MYI360

Squares and roots of 1388206728

• 1388206728 squared (1388206728²) is 1927117919664465984
• 1388206728 cubed (1388206728³) is 2675238061727575181515940352
• The square root of 1388206728 is 37258.6463522227
• The cube root of 1388206728 is 1115.5388891661

Scales and comparisons

• 1,388,206,728 seconds is equal to 44 years, 7 weeks, 2 days, 4 hours, 58 minutes, 48 seconds.
• To count from 1 to 1,388,206,728 would take you about eighty-eight 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 1388206728 cubic inches would be around 93 feet tall.

Recreational maths with 1388206728

• 1388206728 backwards is 8276028831
• The number of decimal digits it has is: 10
• The sum of 1388206728's digits is 45
• More coming soon!