8 6 4 7 is a prime number.

[usonian]

There you go.
Courtesy of https://www.numberempire.com/8647

Now, here's something interesting.

In binary: 10000111000111
In Hexadecimal: 0x21C7, or just plain 21C7
So you could say: 21👁️7

If you think that the binary is hard to remember,
10
000
111
000
111

PRETTY COOL!
Ordering my binary bumper sticker tonight.

AND IF THAT'S NOT ENOUGH

I like that. I've already memorized it.
A tune, anyone?
Ordering a second bumper sticker.

More obscure

Not so easy to memorize.