2025:
1) is a square: 45^2
2) is the product of two squares: 92 x 52
3) is the sum of 3-squares: 402+202+52
4) is the sum of cubes of all the single digits: 13+23+33+43+53+63+73+83+93
5) sum of the single digits squared: (1+2+3+4+5+6+7+8+9)^2
6) sum of the first 45 odd numbers: 1+3+5+…+89
7) is a Harshad number:
https://en.m.wikipedia.org/wiki/Harshad_number