New Revised Standard Version
Counting all the males, from a month old and upward, there were eight thousand six hundred, attending to the duties of the sanctuary.

Contemporary English Version
and they had 8,600 men and boys at least one month old.

New American Bible
Their enrollment, registering every male of a month or more, was eight thousand three hundred. They were the ones who performed the duties of the sanctuary.

Douay-Rheims Bible
All of the male sex from one month and upward, eight thousand six hundred: they shall have the guard of the sanctuary,

All of the male sex from one month and upward, eight thousand six hundred: they shall have the guard of the sanctuary,

eight thousand

Numbers 4:35,36 From thirty years old and upward, unto fifty years old, all that go in to the ministry of the tabernacle of the covenant: . . .

keeping

Numbers 3:7,31 And observe whatsoever appertaineth to the service of the multitude before the tabernacle of the testimony, . . .