You should put the number in a better place. You have identified that putting it in the small gap between logo and deposit button is not a great solution, and given the nature of the value in the context of banking, it is important that the verbose value be communicated to the User.
[expanding upon this answer due to popular demand]
In financial reporting, accountants should not round numbers where it affects materiality , is rounding 2,490,000.00 to 2.5M going to cause a problem with or for the User?
With such an abbreviation using rounding in place, what is the true value of this piece of information? A User could compare it against their memory of the value the last time they took note of it and determine whether a drastic increase or decrease has occurred (e.g. won lottery | lost all their money), however the inaccuracy and simplification of the data does not allow the User to note the kind of changes to the value that would be typical of a human being living a normal life (e.g. paycheck received | bill paid | shopping spree consequences).
So, what alternatives do you have? Well, what are you actually trying to do with this small portion of screen that holds high value due to it being at the top portion of the screen?
Leave the space empty: depending on the density of information that will take place on the remainder of the screen, forcing some "important but abbreviated beyond use" data into it may simply increase density and detriment the User by adding to cognitive load.
Assuming you really want to provide some measure of personal worth to the User: use iconography or perhaps a progress bar (to the next significant milestone, e.g. 1k, 5k, 10k, 20k, etc) to represent personal worth.