The number 8647 has other meanings

 Garfield 49, Lincoln 56, Kennedy 46, McKinley 58 

49+56+46+58 = 209

49+56+46+58+78 = 287

"Garfield 49 Lincoln 56 Kennedy 46 McKinley 58 Trump 78" = 1911 (Satanic)

The number 1911

 All the secret societies use it. The "Black Hand" that start WW1 was founded in the year 1911.  The Rosicrucians opened their temple in California on the 33rd parallel in the year 1911. 

Because of the number 1911. 

"Ancient and Accepted Scottish Rite of Freemasonry" = 1911 (Jewish)

"Garfield 49 Lincoln 56 Kennedy 46 McKinley 58 Trump 78" = 3150 (Fibonacci)

"Garfield Lincoln Kennedy McKinley" = 311 (Ordinal)

"Garfield Lincoln Kennedy McKinley" = 1335 (Latin) 1335+5331 = 6666

"Eighty Six Forty Seven" = 275 (Ordinal)

"The Fall Of The United States" = 275 (Ordinal)

6*14+20*25=  584