Their horses seven hundred thirty- six, their mules two hundred forty-five,

They had seven hundred and thirty-six horses, two hundred and forty-five transport beasts,

Their horses - seven hundred, etc. - They went into captivity, stripped of every thing; they now return from it, abounding in the most substantial riches, viz., horses 736, or, according to Esdras, 7036; mules, 245; camels, 435; asses, 6720; besides gold, and silver, and rich stuffs. See below.

So that the far greatest part of them must walk on foot, since these can be thought to be little more than sufficient to carry their goods or baggage; some copies of the Vulgate Latin read six hundred and thirty six horses (c).
(c) Ed. of Sixtus V. and the Lovain in James's Contrariety of Popish Bibles, p. 295.