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Panchromatic spectral energy distribution (SED) from the ultraviolet (UV),optical to infrared (IR) photometry of NGC 628, combined with the evolutionarystellar population synthesis, is used to derive the spatially resolved age,metallicity and reddening maps. These parameter distributions show that thebulge of this galaxy is a disk-like pseudobulge, which has the S{\'e}rsic indexclose to the exponential law, rich gas, and a young circumnuclear ringstructure. We also discover the disk has two distinct regions with differentradial age and metallicity gradients. The inner region is older and has a muchsteeper age gradient than the outer region of the disk. Both these two regionsand the central young structure can be seen in the radial profile of theoptical color. Based on the age and reddening distributions, we consider thatthe pseudobulge and disk are likely to have grown via the secular evolution,which is the redistribution of mass and energy through the angular momentumtransport caused by the non-axisymmetric potential of the spirals. However,possible gas accretion events could affect the outer region of the disk, due toabundant H{\sc i} gas accumulating in the outer disk.

Stellar Population Properties and Evolution Analysis of NGC 628 with the Panchromatic Photometry