About the Number 45 (forty-five)

MathBabbler created a nBAB for the number 55 because 55 is in the Fibonacci sequence. While working on the nBAB for 55 he discovered it was a Kaprekar number. Just a few days earlier he documented Kaprekar numbers for the first time when he created a nBAB for the number 99. 45 is also a Kaprekar number.

   MathBabbler Number Analyst (MBNA) output:
   =========================================
   45 is a natural, whole, integer
   45 is odd
   45 proper divisors are: 1,3,5,9,15,
   45 is deficient (sum of divisors is 33)
   45 is unhappy
   45 is a Harshad number
   45 is not prime
   45 is undulating
   45 has the prime factors: 3*3*5
   45 in octal is 055
   45 in hexadecimal is 0x2d
   45 in binary is 101101 (is evil)
   45 nearest square numbers: -9...4 (36...49 [7])
   sqrt(45) = 6.7082
   ln(45) = 3.80666
   log(45) = 1.65321
   45 reciprocal is .02222222222222222222222222222222
   45! is 1.19622e+56
   45 is 14.3239 Pi years
   45 is 2 score and 5 years
   45 written as a Roman numeral is XLV

45 is a Kaprekar number.

   45^2 = 2025
   2025 split into two parts:  20|25
   sum of the two parts:  20 + 25 = 45

Creator: Gerald Thurman [gthurman@gmail.com]
Created: 25 March 2009