Of adults in the U.S. who use a smartphone, 63 percent have at least one financial app installed, and the average smartphone user has 2.5 financial apps, according to a new report from Bankrate.com.

Among millennials (18–37-year-olds), the average number of financial apps is 3.6. The figure drops to 2.3 for members of Gen X (age 38–53), and 1.4 for baby boomers (age 54–72).

Predictably, full-service banking platforms lead the app count; 55 percent of U.S. adults who have a smartphone have at least one full-service banking app, and 23 percent have at least two.

Peer-to-peer payments apps such as Venmo, PayPal and Square Cash are the second most common downloads. Forty-one percent of smartphone users have at least one of these and 15 percent have more than one.

Standalone budgeting and investing apps were found on just 18 percent and 17 percent of smartphones, respectively. Mint, Clarity Money and Wally are among the best-known budgeting apps. Stash, Acorns and Betterment are popular for investing.

Consumers are most likely to engage with banking apps, Bankrate.com said. Seven in 10 use them at least once a week, compared with 56 percent who use budgeting apps, 51 percent who use investing apps and 38 percent who use P2P apps with the same frequency.

Nearly 1 in 3 (29 percent) financial app users believe those apps are better than nonfinancial apps; just 9 percent think they are worse.

"The data should encourage those not currently using mobile banking to consider it, because the people who do are using it frequently and seem generally satisfied with their experiences," Bankrate.com Senior Analyst Robert Barba said in the release.

Bankrate.com commissioned YouGov Plc to conduct the survey. Total sample size was 1,156 adults (956 smartphone users). The survey was carried out online Jan. 25 and 26.