He awoke as he returned to the Sol system. He was pleased to find that Earth was still there. He monitored the readouts, since there was little else to do on his approach. Then, he received a hail. He was pleased to discover that they were still prepared to accommodate him, physical body and all.
He wasn't terribly surprised that none of his friends were still alive, as he'd been away for so very long.
He toured the planet again, to see it in person. He liked that the beauty had been preserved outside of the urbanized areas. He noticed that he was meeting a lot of robots, which was fine, since new people were new people, and he had to catch up with life on Earth. At the third town, though, he asked a sufficiently amicable robot about how many humans were alive on Earth.
He was surprised to find that there was now exactly one.