9900

Properties by base:

More about this number at Positiv Integers and Number Empire.

The number is not a prime.

Its 7 (4 unique) factors are:
2² = 4
3² = 9
5² = 25
11

Its 54 divisors are:
1
2
3
4
5
6
9
10
11
12
15
18
20
22
25
30
33
36
44
45
50
55
60
66
75
90
99
100
110
132
150
165
180
198
220
225
275
300
330
396
450
495
550
660
825
900
990
1100
1650
1980
2475
3300
4950
9900
Its aliquote sum is:
23952
makeing it a abundant number.

As Unicode codepoint (since version 4.1) this number represents this character:⚬ MEDIUM SMALL WHITE CIRCLE in Misc_Symbols (Source: https://ucdapi.org/unicode/latest/codepoint/dec/9900); HTML: ⚬

The number appears at position 6183 of the decimal digits of π surrounded by
58429725916778131496990090192116971737278476 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: 782.959ms; cpu: 66.0540000000001ms)