How to understand that field is Number? [Reflection]

I have the method which accepts Field and Object

public String format(Field field, Object o) {....}

I want to know if field can be cast to number.

I have noticed that if write something like this(for long primitive):

field.getType().isAssignableFrom(long.class)

returns true

but

field.getType().isAssignableFrom(Long.class)

returns false

and

field.getType().isAssignableFrom(Number.class)

returns false too

---

Also

field.getType().cast(Number.class)

returns ClassCastException

Please help to write method which will return true if field is actually number(int, long, byte...,also all wrappers) and false in other cases.