Is the Deveron cabinet solid plywood or particleboard?

The box is plywood, which is more moisture-resistant and holds fasteners better than particleboard. Doors and shelves may use other materials, so check the full spec sheet if that matters to you.

Can I hang this over a toilet?

Yes. At 24 inches wide, 18 tall, and 12 deep, it fits above most toilets with clearance for the tank lid. Anchor it into studs or use heavy-duty toggle anchors for drywall.

Does it come with hinges and a handle?

The listing does not confirm hardware. Assume you may need to buy hinges and a knob or pull separately, and check the box contents before installing.

Will the dove white match my other white cabinets?

Dove white is a soft off-white, not a bright builder white. It can read slightly warmer next to pure white cabinets, so compare a door sample if a close match matters.

Is one 24-inch cabinet enough for a bathroom?

It gives about two shelves of shallow storage, enough for towels, toiletries, and extras. For a shared bathroom, two units or a taller cabinet usually works better.