In an address, that would probably mean "suite" 723, which works basically like an apartment number: the building they're in is subdivided into suites, each of which might be occupied by a different business. The suite number (or letter) is used so that they all have distinct mail addresses even though there's only one street address for the building as a whole.
The factors of 723 are: 1, 3, 241, 723.
723-150 = 573
723 as a decimal = 723.0
St and Ste are abbreviations for "saint" and "sainte" meaning "holy" in French. They are used for patron saints.
3, 241 are the factors of 723
723 is divisible by 3
About 580m above mean sea level. This is the altitude at the Sault Ste. Marie Water Aerodome. Source: Wikipedia.
"Kak ste?" (как сте?) means "How do you do?"
723 is composite. Its positive integer factors are: 1, 3, 241, 723
723 micrograms = 0.723 milligrams.
241
0.0194