  We present multi-frequency radio observations with the Giant Metrewave Radio
Telescope and Very Large Array, and X-ray observations with the X-ray
Multi-Mirror Mission ({\it XMM-Newton}) telescope of the giant radio source
(GRS) 3C 457. We have detected the core, lobes and the environment of the GRS
in X-ray. We examine the relationships between the radio and X-ray emission,
determine the radio spectrum over a large frequency range and attribute the
X-ray emission from the lobes to the inverse-Compton scattering of cosmic
microwave background (CMB) photons. The magnetic field strength of the lobes is
very close to the equipartition value. Both the lobes are in pressure balance
near the hotspots and apparently under-pressured towards the core. The X-ray
spectrum of the core of the GRS consists of an unabsorbed soft power-law
component and a heavily absorbed hard power-law component. The soft unabsorbed
component is likely to be related to the radio jets. There is no strong
evidence of Fe K$\alpha$ emission line in our data.
