Numberwise

7816

ISO/IEC 7816 defines contact smart cards.

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Where 7816 fits

Where 7816 fits: Technology, Related numbersTechnology: Standards issued by an organisation. Related numbers: 7810, 8583, 7811.TechnologyStandards issued by an orga…Related numbers7810858378117816
7816 connects to 2 worlds: technology, related numbers.

Why 7816 is special

It specifies the gold contact pad's dimensions and electrical behaviour, which is why a bank card, SIM and identity card all work in readers built by unrelated manufacturers.

7816 is part of

Standards and specification numbersNumbers around us

Factors & digit properties

Divisors (8)
1, 2, 4, 8, 977, 1954, 3908, 7816
Prime factorisation
2^3 × 977
Digit sum
22
Digital root
4

Representations

Decimal
7816
Binary
1111010001000
Octal
17210
Hexadecimal
1e88
Scientific notation
7.816 × 10^3

Other mathematical patterns

  • Deficient number

Related numbers & connections

Documented appearance
The contact pad and signalling of a chip card are specified separately from its physical size.

The contact pad and signalling of a chip card are specified separately from its physical size.

Connection
ISO 7810 fixes a card's physical size and 7816 its contact pad and signalling. Together they are why any card works in any reader.

ISO 7810 fixes a card's physical size and 7816 its contact pad and signalling. Together they are why any card works in any reader.

View 7810 →

Numbers Around Us

  • appears inStandards issued by an organisation
    why?

    Strength 0.50, confidence "high".

Other connections

  • is associated with7810
    why?

    Strength 0.50, confidence "high".

  • is associated with8583
    why?

    Strength 0.50, confidence "high".

  • contrasts with7811
    why?

    Strength 0.50, confidence "high".

How is 7816 connected to another number? →

Technology & computing

  • ISO 7816 fixes the position, size and signalling of a smart card's contacts. Interoperability between cards and readers made by different companies in different countries follows entirely from that.

    DocumentedTechnology & computing

Common questions

Is 7816 a prime number?

No, 7816 is not prime.

What are the factors of 7816?

The factors of 7816 are 1, 2, 4, 8, 977, 1954, 3908, 7816.

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