37

37 is a prime number.

37 is the least number of 5th powers needed to represent every possible integer.

37 is the maximum number of regions into which 8 lines divide the plane.

The sum of the first 37 primes is a Fibonacci number.

37 has a representation as a sum of two squares: 37 = 1² + 6².

37 is the hypotenuse of a primitive Pythagorean triple: 37² = 12² + 35².

37 is a centered hexagonal number.

Abraham Lincoln was first elected to the U.S. House of Representatives at age 37.

Source: 37 Heaven!