644

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:
2² = 4
7
23

Its 12 divisors are:
1
2
4
7
14
23
28
46
92
161
322
644
Its aliquote sum is:
700
makeing it a abundant number.

As Unicode codepoint (since version 1.1) this number represents this character:ʄ LATIN SMALL LETTER DOTLESS J WITH STROKE AND HOOK in IPA_Ext (Source: https://www.unicode.org/Public/UCD/latest/ucdxml/ucd.all.grouped.zip); HTML: ʄ

In the work of Johann Sebastian Bach BWV 644 is Ach wie nichtig, ach wie flüchtig

The number appears at position 181 of the decimal digits of π surrounded by
8410270193852110555964462294895493038196442 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: 751.9ms; cpu: 87.269ms)