In the report it says more respondents consider themselves Full-stack Developers than any other role. On average, Full-stack developers are comfortable coding with 5 to 6 major languages or frameworks (vs. 4 for everyone else). Executives are comfortable using more languages and frameworks than any other developer occupation, which is most likely a result of having more experience.
There are roughly just as many developers who call themselves Mobile Developers as there are Android Mobile Developers (3% for each). About 2.5% of all developers are iOS Mobile Developers. We received 59 responses from Windows Phone Mobile Developers (.1%).
You can view the full report here which has interesting results pertaining to areas such as occupation, demographics, education, technologies, and so on.