28138407

Names of 28138407

• Cardinal: 28138407 can be written as Twenty-eight million, one hundred thirty-eight thousand, four hundred seven.

Scientific notation

• Scientific notation: 2.8138407 × 10⁷

Factors of 28138407

• Number of distinct prime factors ω(n): 5
• Total number of prime factors Ω(n): 5
• Sum of prime factors: 451

Divisors of 28138407

• Number of divisors d(n): 32
• Complete list of divisors:
  1 3 11 23 33 69 131 253 283 393 759 849 1441 3013 3113 4323 6509 9039 9339 19527 33143 37073 71599 99429 111219 214797 407803 852679 1223409 2558037 9379469 28138407
• Sum of all divisors σ(n): 43186176
• Sum of proper divisors (its aliquot sum) s(n): 15047769
• 28138407 is a deficient number, because the sum of its proper divisors (15047769) is less than itself. Its deficiency is 13090638

Bases of 28138407

• Binary: 1101011010101101110100111₂
• Hexadecimal: 0x1AD5BA7
• Base-36: GR3QF

Squares and roots of 28138407

• 28138407 squared (28138407²) is 791769948497649
• 28138407 cubed (28138407³) is 22279145061195886105143
• The square root of 28138407 is 5304.5647323791
• The cube root of 28138407 is 304.1584145215

Scales and comparisons

• 28,138,407 seconds is equal to 46 weeks, 3 days, 16 hours, 13 minutes, 27 seconds.
• To count from 1 to 28,138,407 would take you about seventeen weeks!

  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 28138407 cubic inches would be around 25.3 feet tall.

Recreational maths with 28138407

• 28138407 backwards is 70483182
• 28138407 is a Harshad number.
• The number of decimal digits it has is: 8
• The sum of 28138407's digits is 33
• More coming soon!