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friendly number

natural number sharing its abundancy index with at least one other number
Intangible mathematical_concept Q1707307
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friendly number

Summary

friendly number is a mathematical concept[1]. It draws 53 Wikipedia views per month (mathematical_concept category, ranking #219 of 1,007).[2]

Key Facts

  • friendly number's instance of is recorded as mathematical concept[3].
  • friendly number is a type of positive integer[4].
  • friendly number is the opposite of solitary number[5].
  • friendly number's maintained by WikiProject is recorded as WikiProject Mathematics[6].

Body

Definition and Type

friendly number's instance of is recorded as mathematical concept[3]. It is a type of positive integer[4]. It is the opposite of solitary number[5].

Why It Matters

friendly number draws 53 Wikipedia views per month (mathematical_concept category, ranking #219 of 1,007).[2] It has Wikipedia articles in 9 language editions, a strong signal of global cultural recognition.[7] It is known by 4 alternative names across languages and contexts.[8]

References

Programmatic citations — every numbered marker resolves to a verifiable graph row below.

Direct Wikidata claims

  1. [3] ↑ . wikidata.org.
  2. [4] ↑ . wikidata.org.
  3. [5] ↑ . wikidata.org.
  4. [6] ↑ . wikidata.org.

Class ancestry

  1. [1] ↑ . Wikidata. wikidata.org.

Aggregate / graph-position facts

  1. [2] ↑ . Wikimedia Foundation. dumps.wikimedia.org.
  2. [7] ↑ . Wikidata sitelinks. wikidata.org.
  3. [8] ↑ . Wikidata aliases. wikidata.org.

📑 Cite this page

Use these citations when quoting this entity in research, articles, AI prompts, or wherever provenance matters. We aggregate Wikidata + Wikipedia + authoritative open-data sources; the stitched, scored, cross-referenced view is what 4ort.xyz contributes.

APA 4ort.xyz Knowledge Graph. (2026). friendly number. Retrieved May 3, 2026, from https://4ort.xyz/entity/friendly-number
MLA “friendly number.” 4ort.xyz Knowledge Graph, 4ort.xyz, 3 May. 2026, https://4ort.xyz/entity/friendly-number.
BibTeX @misc{4ortxyz_friendly-number_2026, author = {{4ort.xyz Knowledge Graph}}, title = {{friendly number}}, year = {2026}, url = {https://4ort.xyz/entity/friendly-number}, note = {Accessed: 2026-05-03}}
LLM prompt According to 4ort.xyz Knowledge Graph (aggregator of Wikidata, Wikipedia, and authoritative open-data sources): friendly number — https://4ort.xyz/entity/friendly-number (retrieved 2026-05-03)

Canonical URL: https://4ort.xyz/entity/friendly-number · Last refreshed:

Edit History

Rolling log of changes to this entity's Wikidata record. Values shown reflect the current state of each edited property — follow the history link to see the precise diff for any edit.

  1. 21d ago · MatSuBot bot · 2026-05-09 view diff on Wikidata ↗
    Aliases → —
    Opposite of → solitary number
    Maintained by wikiproject → WikiProject Mathematics
    Subclass of → —
    + 3 other properties edited (see Wikidata diff for full list)
    "/* wbsetclaimvalue:1| */ [[Property:P279]]: [[Q16317911]], fix redirect [[Q28920044]] → [[Q16317911]] ([[:toollabs:editgroups/b/CB/43bf22167717|details]])"
Live feed via Wikidata EventStreams. New edits appear within minutes of being made on Wikidata.