It is a happy number.
78987656 is an esthetic number in base 10, because in such base its adjacent digits differ by 1.
It is an alternating number because its digits alternate between odd and even.
Almost surely, 278987656 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 78987656, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (81591840).
It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.
78987656 is a wasteful number, since it uses less digits than its factorization.
78987656 is an evil number, because the sum of its binary digits is even.
The square root of 78987656 is about 8887.4999859353. The cubic root of 78987656 is about 429.0616929587.
The spelling of 78987656 in words is "seventy-eight million, nine hundred eighty-seven thousand, six hundred fifty-six".