Abnormal Inact Memory

Hello, have a look my top and ps as below
Inact memory reach 1.6G, does it normal ?

load averages: 0.07, 0.02, 0.01; up 7+06:48:52 02:58:01
91 processes: 2 running, 89 sleeping
CPU states: 0.0% user, 0.0% nice, 0.4% system, 0.0% interrupt, 99.6% idle
Memory: 24M Active, 1625M Inact, 189M Wired, 78M Cache, 112M Buf, 79M Free
Swap: 1024M Total, 40K Used, 1024M Free
Order to sort: res
PID USERNAME THR PRI NICE SIZE RES STATE TIME CPU COMMAND
28116 mysql 9 20 0 13M 3840K kserel 0:01 0.00% mysqld
28089 www 1 4 0 4312K 3740K accept 0:00 0.00% httpd
28068 www 1 4 0 4312K 3736K accept 0:00 0.00% httpd
28064 www 1 4 0 4312K 3736K accept 0:00 0.00% httpd
28059 root 1 96 0 4228K 3620K select 0:00 0.00% httpd
28587 gary 1 96 0 6076K 2672K RUN 0:00 0.00% sshd
28582 root 1 4 0 6100K 2664K sbwait 0:00 0.00% sshd
28613 root 1 8 0 2272K 1956K wait 0:00 0.00% bash
521 root 1 4 0 3352K 1688K select 0:04 0.00% sshd
34363 root 1 96 0 2012K 1628K RUN 0:00 0.00% top
28172 root 1 4 0 1772K 1316K select 0:00 0.00% authdaemond
28173 root 1 4 0 1772K 1316K select 0:00 0.00% authdaemond
28175 root 1 96 0 1772K 1316K select 0:00 0.00% authdaemond
28174 root 1 96 0 1772K 1316K select 0:00 0.00% authdaemond
28176 root 1 96 0 1772K 1316K select 0:00 0.00% authdaemond