The number 78 is classified as a deficient number. A perfect number is equal to the sum of its proper divisors, and an abundant number has a sum of proper divisors greater than the number itself. The proper divisors of 78 (1, 2, 3, 6, 13, 26, and 39) sum to 90, which is greater than 78, indicating that 78 is actually abundant.
abundant
deficient
It is deficient.
it is abundant
abundant
13 is deficient.
deficient
It is deficient.
perfect
It's deficient
36 is abundant.
90 is abundant.