77 (number)
natural number
77 (seventy-seven) is the natural number following 76 and preceding 78. Seventy-seven is the smallest positive integer requiring five syllables in English.
In mathematics
77 is:
the 22nd discrete semiprime and the first of the (7.q) family, where q is a higher prime.
with a prime aliquot sum of 19 within an aliquot sequence (77, 19, 1, 0) to the Prime in the 19-aliquot tree. 77 is the second composite member of the 19-aliquot tree with 65
a Blum integer since both 7 and 11 are Gaussian primes.
the sum of three consecutive squares, 42 + 52 + 62.
the sum of the first eight prime numbers.
the number of integer partitions of the number 12.
the largest number that cannot be written as a sum of distinct numbers whose reciprocals sum to 1.
the number of digits of the 12th perfect number.
“77 (number)” enters the record as natural number. Crown Archives preserves that source wording while asking what number and natural can confirm, complicate or overturn.
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“77 (number)” is worth following because a concise public description often conceals a longer documentary argument. Here, number and natural provides the most credible route into that argument.
Named sources, stable identifiers and responsible institutions provide the strongest route from overview to verifiable evidence. The source revision retrieved here is dated Jul 31, 2026. The linked authority identifier is Q713167. None of the 0 selected statements returned an explicit reference.
The absence of detail may reflect summary conventions rather than a lack of surviving documentation. The lead is largely declarative, so disagreement and counter-evidence require a deliberate search beyond the opening account. Authority statements aid reconciliation but still require their own references, qualifiers and ranks to be checked.
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This entry incorporates text from “77 (number)” on English Wikipedia. Contributors are listed in the page history. Text is available under the Creative Commons Attribution-ShareAlike 4.0 License. Selected authority identifiers and statements are retrieved from Wikidata under CC0; their references and qualifiers remain part of the verification path.