71530038720 is a `hidden beast` number, since 71 + 530 + 0 + 38 + 7 + 20 = 666.
It is a tau number, because it is divible by the number of its divisors (336).
It is a congruent number.
It is an unprimeable number.
Almost surely, 271530038720 is an apocalyptic number.
71530038720 is a gapful number since it is divisible by the number (70) 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 71530038720, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (147990885120).
It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.
71530038720 is a wasteful number, since it uses less digits than its factorization.
71530038720 is an odious number, because the sum of its binary digits is odd.
The spelling of 71530038720 in words is "seventy-one billion, five hundred thirty million, thirty-eight thousand, seven hundred twenty".