It is a happy number.
It is a tau number, because it is divible by the number of its divisors (80).
It is a congruent number.
It is an unprimeable number.
Almost surely, 263991760 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 63991760, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (85560000).
It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.
63991760 is a wasteful number, since it uses less digits than its factorization.
63991760 is an evil number, because the sum of its binary digits is even.
The square root of 63991760 is about 7999.4849834224. The cubic root of 63991760 is about 399.9828325965.
The spelling of 63991760 in words is "sixty-three million, nine hundred ninety-one thousand, seven hundred sixty".