978
978 is the ISBN prefix that identifies a book.
- Even
- Composite
Where 978 fits
Why 978 is special
ISBNs were extended to thirteen digits in 2007 by prefixing 978, which made them valid EAN barcodes. A book's barcode and its identifier became the same number, which is why any scanner can read one.
Factors & digit properties
- Divisors (8)
- 1, 2, 3, 6, 163, 326, 489, 978
- Prime factorisation
- 2 × 3 × 163
- Digit sum
- 24
- Digital root
- 6
Representations
- Decimal
- 978
- Binary
- 1111010010
- Octal
- 1722
- Hexadecimal
- 3d2
- Roman numeral
- CMLXXVIII
- Scientific notation
- 9.780 × 10^2
Other mathematical patterns
- Abundant number
Related numbers & connections
978 and 979 are the two ISBN prefixes. Books issued under 979 have no ten-digit form at all, which quietly breaks systems that still assume one.
View 979 →Other connections
- is associated with979
why?
Strength 0.50, confidence "high".
Technology & computing
Prefixing 978 turned ten-digit ISBNs into thirteen-digit EAN codes in 2007, so book identifiers became ordinary retail barcodes. One change made every supermarket scanner able to read a book.
DocumentedTechnology & computingPeriod: 2007
Common questions
Is 978 a prime number?
No, 978 is not prime.
What are the factors of 978?
The factors of 978 are 1, 2, 3, 6, 163, 326, 489, 978.
What is 978 in Roman numerals?
978 in Roman numerals is CMLXXVIII.
About this page's data
Mathematical facts:computed directly from the number's value — nothing to source or verify externally.
Contextual records: 1 reviewer-confirmed record, sourced and reviewed before publication.
Last reviewed: 3 August 2026