It is a happy number.
It is a congruent number.
It is an unprimeable number.
Almost surely, 277138784 is an apocalyptic number.
77138784 is a gapful number since it is divisible by the number (74) formed by its first and last digit.
It is an amenable number.
It is a practical number, because each smaller number is the sum of distinct divisors of 77138784, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (122572800).
It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.
77138784 is a wasteful number, since it uses less digits than its factorization.
77138784 is an evil number, because the sum of its binary digits is even.
The square root of 77138784 is about 8782.8687796187. The cubic root of 77138784 is about 425.6875312268.
The spelling of 77138784 in words is "seventy-seven million, one hundred thirty-eight thousand, seven hundred eighty-four".