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The Number 90: Properties and Meanings

Prime Factors of 90=2x3x3x5.

90 can be Partitioned 46 times with each term no larger than 2.

90 can be Partitioned 721 times with each term no larger than 3.

90 is a 31-gonal Number.

90 is an Abundant Number.

90 is a Schröder Number.

A Truncated Dodecahedron is an Archimedean Solid with 90 Edges.

A Truncated Icosahedron is an Archimedean Solid with 90 Edges.

90 Antiope is an asteroid named after Antiope from Greek mythology, though it is disputed as to whether this is Antiope the Amazon or Antiope the mother of Amphion and Zethus.


The Year 90 AD

In the year 90 AD Cologne became the capital of Germania Inferior.

In the year 90 AD Pliny the Younger's appointment as urban quaestor ended.

In the year 90 AD a Chinese campaign smashed the northern Hsiung Nu (Hun) tribes and started thetribes' migration to Europe.

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