man getaddrinfo:

node specifies either a numerical network address (for IPv4, numbers-and-dots
notation as supported by inet_aton(3)

man inet_aton:

a         The value a is interpreted as a 32-bit value that is
          stored directly into the binary address without
          any byte rearrangement.

Видимо, поэтому.

Внезапно

$ ping 134744072
PING 134744072 (8.8.8.8) 56(84) bytes of data.
64 bytes from 8.8.8.8: icmp_seq=1 ttl=45 time=20.8 ms
64 bytes from 8.8.8.8: icmp_seq=2 ttl=45 time=20.2 ms
64 bytes from 8.8.8.8: icmp_seq=3 ttl=45 time=20.1 ms

да, похоже. Вот это засада.