On 27 March 2009 the DJIA closed at 7776.18, which prompted MathBabbler to create a nBAB for the number 7777. After posting the nBAB for 7777, MathBabbler observed that he had nBABs for 7 and 7777, but he did not nBABs for 77 and

`.`

777MathBabbler Number Analyst (MBNA) output: ========================================= 777 is a natural, whole, integer 777 is odd 777 proper divisors are: 1,3,7,21,37,111,259, 777 is deficient (sum of divisors is 439) 777 is unhappy 777 is a Harshad number 777 is not prime 777 is undulating 777 has the prime factors: 3*7*37 777 is sphenic (had 3 unique prime factors) 777 in octal is 01411 777 in hexadecimal is 0x309 777 in binary is 1100001001 (is evil) 777 nearest square numbers: -48...7 (729...784 [28]) sqrt(777) = 27.8747 ln(777) = 6.65544 log(777) = 2.89042 777 reciprocal is .00128700128700128700128700128700 777! is 1.79749e+1910 777 is 247.327 Pi years 777 is 38 score and 17 years 777 written as a Roman numeral is DCCLXXVII

`is a palindromic number. [Note: On 29 March 2009 the MBNA only checked prime numbers to see if they were palindromic.]`

777

**Creator:** Gerald Thurman
[gthurman@gmail.com]

**Created:** 29 March 2009

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