We present a multi-wavelength analysis of galaxies selected at 450 and 850 µm from the deepest SCUBA-2 observations in the Extended Groth Strip (EGS) field, which have an average depth of σ 450 = 1.9and σ 850 = 0.46 mJy beam −1 over ∼ 70 arcmin 2 . The final sample comprises 95 sources: 56 (59 %) are detected at both wavelengths, 31 (33 %) are detected only at 850 µm, and 8 (8 %) are detected only at 450 µm. We identify counterparts for 75 % of the whole sample. The redshift distributions of the 450 and 850 µm samples peak at different redshifts with median values ofz = 1.66 ± 0.18 and z = 2.30±0.20, respectively. However, the two populations have similar IR luminosities, SFRs, and stellar masses, with mean values of 1.5 ± 0.2 × 10 12 L ⊙ , 150 ± 20 M ⊙ /yr, and 9.0 ± 0.6 × 10 10 M ⊙ , respectively. This places most of our sources ( 85 %) on the high-mass end of the 'main-sequence' of star-forming galaxies. Exploring the IR excess vs UV-slope (IRX-β) relation we find that the most luminous galaxies are consistent with the Meurer law, while the less luminous galaxies lie below this relation. Using the results of a two-dimensional modelling of the HST H 160 -band imaging, we derive a median Sérsic index of n = 1.4 +0.3 −0.1 and a median half-light radius of r 1/2 = 4.8 ± 0.4 kpc. Based on a visual-like classification in the same band, we find that the dominant component for most of the galaxies at all redshifts is a disk-like structure, although there is a transition from irregular disks to disks with a spheroidal component at z ∼ 1.4, which morphologically supports the scenario of SMGs as progenitors of massive elliptical galaxies.