6400

Properties by base:

More about this number at Positiv Integers and Number Empire.

The number is not a prime.

Its 10 (2 unique) factors are:
2⁸ = 256
5² = 25

Its 27 divisors are:
1
2
4
5
8
10
16
20
25
32
40
50
64
80
100
128
160
200
256
320
400
640
800
1280
1600
3200
6400
Its aliquote sum is:
9441
makeing it a abundant number.

As Unicode codepoint (since version 4.0) this number represents this character:ᤀ LIMBU VOWEL-CARRIER LETTER in Limbu (Source: https://ucdapi.org/unicode/latest/codepoint/dec/6400); HTML: ᤀ

The number appears at position 5091 of the decimal digits of π surrounded by
09806769282382806899640048243540370141631496 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: 762.344ms; cpu: 72.1270000000089ms)