90

Properties by base:

More about this number at Positiv Integers and Number Empire.

The number is not a prime.

Its 4 (3 unique) factors are:
2
3² = 9
5

Its 12 divisors are:
1
2
3
5
6
9
10
15
18
30
45
90
Its aliquote sum is:
144
makeing it a abundant number.

As Unicode codepoint (since version 1.1) this number represents this character:Z LATIN CAPITAL LETTER Z in ASCII (Source: https://ucdapi.org/unicode/latest/codepoint/dec/90); HTML: Z

In the work of Johann Sebastian Bach BWV 90 is Es reißet euch ein schrecklich Ende

The number appears at position 247 of the decimal digits of π surrounded by
482337867831652712019091456485669234603486 Source: The Pi-Search Page

Computations done with Math::BigInt 1.999811 and Math::Pari 2.030523 based on PARI/GP 2.11.3 (elapsed: 1078.721ms; cpu: 104.360000000001ms)