Php – Apache eats more than 50 Mb for each process

I'm running VPS with debian + apache2 + php (as mod_apache) / 786Mb RAM

The problem is I'm constantly running out of memory.

When I run "top" command it shows around 10 of apache2 processes – and each of them takes >50Mb of memory! I thinks that's too much for each process, am I right? What can cause it?

I'm running few websites with around 1000 hits per day and several rarely visited WordPress blogs.

One of my most visited sites has a lot of med-size images – could it be a problem?

UPDATE (I'm adding process table):

   top - 16:19:52 up  1:55,  1 user,  load average: 0.05, 0.51, 0.80
Tasks:  35 total,   2 running,  33 sleeping,   0 stopped,   0 zombie
Cpu(s):  0.0%us,  0.0%sy,  0.0%ni,100.0%id,  0.0%wa,  0.0%hi,  0.0%si,  0.0%st
Mem:    786432k total,   786432k used,        0k free,        0k buffers
Swap:        0k total,        0k used,        0k free,        0k cached

  PID USER      PR  NI  VIRT  RES  SHR S %CPU %MEM    TIME+  COMMAND
    1 root      15   0 10308  740  620 S  0.0  0.1   0:00.71 init
 9728 root      18   0 62184 1404  968 S  0.0  0.2   0:00.12 rsyslogd
 9741 root      16   0 48860 1204  704 S  0.0  0.2   0:00.16 sshd
 9763 root      15   0  193m  10m 5856 S  0.0  1.4   0:00.32 apache2
 9773 root      15   0 66948 3376 2448 S  0.0  0.4   0:00.43 sshd
 9776 bind      25   0  118m  12m 2624 S  0.0  1.6   0:00.01 named
 9787 root      15   0 12372  644  460 S  0.0  0.1   0:00.02 dovecot
 9813 root      18   0 71128 3004 2292 S  0.0  0.4   0:00.00 dovecot-auth
10060 Debian-e  15   0 42712  996  604 S  0.0  0.1   0:00.00 exim4
10065 nobody    15   0 21276 1432  696 S  0.0  0.2   0:00.02 memcached
10069 mongodb   18   0  116m  15m 4520 S  0.0  2.0   0:03.37 mongod
10076 dovecot   15   0 14216 2000 1604 S  0.0  0.3   0:00.01 imap-login
10117 root      19   0 17320 1448 1148 S  0.0  0.2   0:00.00 mysqld_safe
10157 mysql     15   0  200m  49m 6316 S  0.0  6.5   0:10.69 mysqld
10158 root      18   0  3776  596  504 S  0.0  0.1   0:00.00 logger
10165 root      15   0 42204 2044 1404 S  0.0  0.3   0:00.10 sftp-server
10235 proftpd   18   0 64224 1556  592 S  0.0  0.2   0:00.00 proftpd
11281 root      18   0 18544  928  712 S  0.0  0.1   0:00.01 cron
13549 root      15   0 66220 3172 2448 S  0.0  0.4   0:00.05 sshd
13551 root      15   0 42080 1888 1400 S  0.0  0.2   0:00.01 sftp-server
13560 www-data  15   0  227m  42m 5572 S  0.0  5.5   0:07.49 apache2
15702 root      15   0 66064 3132 2472 R  0.0  0.4   0:00.22 sshd
15849 root      15   0 17452 1700 1244 S  0.0  0.2   0:00.00 bash
20348 dovecot   15   0 14208 1988 1596 S  0.0  0.3   0:00.00 pop3-login
20468 root      15   0 18820 1196  940 R  0.0  0.2   0:01.56 top
21788 www-data  15   0  236m  51m 4164 S  0.0  6.8   0:06.18 apache2
21972 www-data  15   0  232m  48m 4044 S  0.0  6.3   0:07.14 apache2
21973 www-data  18   0  230m  46m 4672 S  0.0  6.1   0:01.82 apache2
26321 www-data  15   0  227m  43m 4060 S  0.0  5.6   0:00.76 apache2
26335 www-data  15   0  229m  46m 4776 S  0.0  6.0   0:00.44 apache2
26336 www-data  15   0  232m  49m 4844 S  0.0  6.4   0:01.37 apache2
26337 www-data  15   0  227m  43m 4148 S  0.0  5.6   0:00.64 apache2
26340 www-data  15   0  227m  43m 4104 S  0.0  5.6   0:00.46 apache2
26341 www-data  18   0  231m  48m 4596 S  0.0  6.3   0:00.44 apache2
27983 root      15   0  106m 8492 6192 S  0.0  1.1   0:00.10 ispmgr