It's about two-fifths as much as a Floppy Disk (3½-in)
In other words, 647.860 kilobytes is 0.449903 times the amount of a Floppy Disk (3½-in), and the amount of a Floppy Disk (3½-in) is 2.2227 times that amount.(high density, IBM PC format)
Despite common reference to them as "1.44" megabyte (mB) disks, the actual capacity of the most common model of a 3&-in (8.9 cm) floppy disk is 1,440 kilobytes. At the height of their use 1996, there were an estimated five billion disks in use — nearly one for each person on Earth at the time.
It's about two-fifths as much as a Digital Photo
In other words, 647.860 kilobytes is 0.42 times the amount of a Digital Photo, and the amount of a Digital Photo is 2.4 times that amount.(5.3 megapixels, JPEG compression, 100% quality, 24 bits/pixel)
A 5.3-megapixel digital camera photo requires about 1,500 kilobytes of storage space. In 2010, it was expected that 90% of all professionally-taken photographs would be digital instead of film.
It's about one-fifth as much as a MP3 Song
In other words, 647.860 kilobytes is 0.2 times the amount of a MP3 Song, and the amount of a MP3 Song is 5 times that amount.(a.k.a. MPEG-1 Audio Layer 3, a.k.a. MPEG-2 Audio Layer 3) (128 Kbps, "near-CD-quality"; 3 minutes duration; average)
A three-minute song of typical quality will be about 3,000 kilobytes when encoded into MP3 format. The song Tom's Diner by Suzanne Vega was used by AT&T-Bell Labs engineer Karlheinz Brandenburg to test the compression process and is considered the first MP3 song.
It's about one-tenth as much as The Complete Works of William Shakespeare
In other words, 647.860 kilobytes is 0.12 times the amount of The Complete Works of William Shakespeare, and the amount of The Complete Works of William Shakespeare is 8.3 times that amount.(ASCII, plain text)
The Complete Works of William Shakespeare would occupy about 5,400 kilobytes when written in plain text without formatting. These works include 38 definitively-attributed plays — 11 tragedies, 17 comedies, and 10 tragedies — as well as 154 sonnets and numerous other poems.
It's about 300 times as much as a Page of Text
In other words, 647.860 kilobytes is 280 times the amount of a Page of Text, and the amount of a Page of Text is 0.004 times that amount.(50 lines, 50 characters per line, ASCII encoding)
A 50-character-per-line, 50-line page of Latin alphabet text requires 2.40 kilobytes when digitally represented. The Google Books project, which has produced hundreds of millions of pages of digital text, used a robotic device to digitize over eight million titles at a rate of about 1,000 pages per second.
It's about one-one-thousandth as much as a Compact Disc
In other words, 647.860 kilobytes is 0.000858 times the amount of a Compact Disc, and the amount of a Compact Disc is 1,165 times that amount.(80-minute, 360,000 sector disc; "Red Book" specifications)
A typical, 80-minute capacity compact disc, commonly known as a 716,800 kilobytes disc will actually hold 755,000 kilobytes of data. Such disks are 1.2 mm (0.047 in) thick.
It's about 6,000 times as much as a Magnetic Stripe Card
In other words, 647.860 kilobytes is 6,000 times the amount of a Magnetic Stripe Card, and the amount of a Magnetic Stripe Card is 0.000 times that amount.(maximum capacity; per ISO 7811 specification)
The storage capacity of a magnetic stripe on a credit or identification card is about 0.10 kilobytes. According to legend, Forrest Parry, the IBM engineer who developed the first magnetic stripe card in 1960, was able to solve the problem of adhering the strip to the card after his wife suggested using an iron.