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.

`is also a Kaprekar number.`

45MathBabbler 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

`is a Kaprekar number.`

4545^2 = 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

This work is licensed under a Creative Commons Attribution 3.0 United States License.