It's about one-and-one-tenth times the number of Submarines in the US Navy
In other words, the count of Submarines in the US Navy is 0.910 times 77.(a.k.a. Subs) (includes all types, all classes) (2015 figures)
It's about nine-tenths the number of Keys on a Piano
In other words, 77 is 0.880 times the count of Keys on a Piano, and the count of Keys on a Piano is 1.10 times that amount.(Moden layout; A0 to C7)
Most modern keyboards have 88 keys, comprising seven octaves and an additional major third. A full-size, acoustic piano may have as many as 12,000 separate parts.
It's about three-fourths the number of Wolves in Yellowstone National Park
In other words, the count of Wolves in Yellowstone National Park is 1.350 times 77.(a.k.a. Henihco'oo; a.k.a. Héetíhco'oo) (December 2014 figures; Wyoming Park area)
As of the 2014 population count, there were 104 wolves living in Yellowstone National Park, in twelve packs. All of the wolves now living in the Park are thought to have descended from the 66 wolves (re)introduced into the Park in 1995-96.
It's about one-and-two-fifths times the number of Countries in Africa
In other words, the count of Countries in Africa is 0.710 times 77.(2016 figures) (sovereign states recognized by the UN only)
The continent of Africa includes 56 sovereign countries recognized by the United Nations as of 2020. It is the second-most populous continent in the world, with 1.3 billion inhabitants.List_of_sovereign_states_and_dependent_territories_in_Africa
It's about two-thirds the number of Elements on the Periodic Table
In other words, 77 is 0.6530 times the count of Elements on the Periodic Table, and the count of Elements on the Periodic Table is 1.530 times that amount.(a.k.a. Periodic Table of the Elements, a.k.a chemical elements) (confirmed elements as of 2016)
It's about one-and-three-fifths times the number of Teeth in a Great White Shark's Mouth
In other words, the count of Teeth in a Great White Shark's Mouth is 0.630 times 77.(Carcharodon carcharias) (average; including developing rows)
It's about three-fifths the number of Union Stations in the United States
In other words, 77 is 0.570 times the count of Union Stations in the United States, and the count of Union Stations in the United States is 1.750 times that amount.(a.k.a. Union Terminal; a.k.a. Joint Station; a.k.a. Union Depot) (2016 figures)
Typically shared between multiple railroad companies and stations, there are about 135 "Union Stations" in the United States. Of these, the busiest station is Chicago Union Station, which handles 120,000 passengers each year.