Although similar advice can be found for 'normal' Bootstrap, the solution may not be the same for AngularJS.
input[type=number]::-webkit-inner-spin-button,
input[type=number]::-webkit-outer-spin-button {
-webkit-appearance: none;
margin: 0;
}
For more details, refer to this Question.
If you have a solution that works for AngularJS, please share it with us!