Numbers are considered sacred in Hinduism, whether even or odd. We chant odd numbers first and then even numbers in the Rudrabhishekam. Here are some significance attached to numbers, both odd and even:
Q: Can you elaborate on the number 7, like there are 7 days in a week,
the 7 continents, the 7 chakras and so on.
Sri Sri Ravi Shankar: Every
number is associated with something sacred and has sacredness to it.
That’s why when the Rudrabhishekam is done, all the numbers are said.
Number 1 and 2 are very sacred. Number 3 is also sacred. Number 3 is
associated with so many things, Brahma, Vishnu and Mahesh; Satva,
Rajas and Tamas; Vata, Pitta and Kapha; Morning, Afternoon and
Evening; Present, Past and Future. So number 3 is very sacred.
number 4 is more sacred. The four directions; the four Vedas has so
much sacredness attached to it. The most sacred of the symbols
Swastika has four corners.
Then number 5, the five elements which are
very sacred; the five organs of senses; five organs of perceptions;
five organs of action. Pancha Devata, there are five important
categories of Devatas. A village panchayat has only five members and
so 5 is very sacred.
Then comes 6, Shad Darshanas, the six systems of
Hindu philosophy; Shadangas, the six angas are very important. Then
the sixth sense, you say the mind is the sixth sense.
Then 7; seven
Swaras, seven Chakras, seven days of the week, seven planets… 8 has
its own sacredness, Ashta Dikpalakas, are the eight divine entities
ruling eight quarters or the universe, Ashtadhatu, eight metals which
are very essential for the body. Ashtalakshmi, the eight types of
wealth. So 8 has its own significance.
Coming to 9, Navagrahas;
Navaratna, nine gems; Navaratri, nine nights. In nine months a child
is born. There are nine types of bhakti. 10 and 11 is also sacred. No
number is left which is not sacred. In the West number 13 is
considered unholy, but in India no number is considered unholy or
unlucky. All the numbers are good numbers. Every number has some
significance, some glory attached to it.
From a Q&A with Sri Sri Ravi Shankar: http://celebrating-silence-of-life.blogspot.in/2011_11_01_archive.html