It is a happy number.
It is a congruent number.
It is an unprimeable number.
78456 is an untouchable number, because it is not equal to the sum of proper divisors of any number.
278456 is an apocalyptic number.
It is an amenable number.
It is a practical number, because each smaller number is the sum of distinct divisors of 78456, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (112320).
It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.
78456 is a wasteful number, since it uses less digits than its factorization.
78456 is an evil number, because the sum of its binary digits is even.
The square root of 78456 is about 280.0999821492. The cubic root of 78456 is about 42.8096871542.
The spelling of 78456 in words is "seventy-eight thousand, four hundred fifty-six".