### About the Number 144 (one hundred forty-four)

MathBabbler created a nBAB for the number 7777 and that prompted the creation of a nBAB for 777 and that prompted the creation a nBAB for 77. The nBAB for 7777 was the 142nd nBAB and the nBAB for 777 was the 143rd nBAB. MathBabbler has used the number `144`; therefore, he delayed posting the nBAB for 77 so that he could make this nBAB about the number `144` nBAB #`144`.

```   MathBabbler Number Analyst (MBNA) output:
=========================================
144 is a natural, whole, integer
144 is even
144 proper divisors are: 1,2,3,4,6,8,9,12,16,18,24,36,48,72,
144 is abundant (sum of divisors is 259)
144 is unhappy
144 is a Harshad number
144 is not prime
144 has the prime factors: 2*2*2*2*3*3
144 is a Fibonacci number
144 in octal is 0220
144 in hexadecimal is 0x90
144 in binary is 10010000 (is evil)
144 nearest square numbers: 144 is square (144 is square)
sqrt(144) = 12
ln(144) = 4.96981
log(144) = 2.15836
144 is 12^2
144 reciprocal is .00694444444444444444444444444444
144! is 5.55029e+249
144 is 45.8366 Pi years
144 is 7 score and 4 years
144 written as a Roman numeral is CXLIV
```

MathBabbler was a bit surprised on 29 March 2009 that he didn't have a nBAB for the number `144`.

`[Wikipedia]` `144` is a sum-product number. A sum-product number is an "integer that in a given base is equal to the sum of its digits times the product of its digits."

```   sum_digits(144) = 9
multiply_digits(144) = 16
9 * 16 = 144
```

OEIS.org::id:A038369

Creator: Gerald Thurman [gthurman@gmail.com]
Created: 29 March 2009 