seven777

777 is an odd, composite, palindromic [1] repdigit. mastercard [2] It is also a sphenic number, [3] with 3, 7, and 37 as its prime factors Its largest prime factor is a concatenation of its smaller two; the only other number below 1000 with this property is 138 An extravagant number, [4] a lucky number, [5] a polite number, [6] and an amenable number