72061105520 has 80 divisors (see below), whose sum is σ = 177522075360. Its totient is φ = 27109834752.

The previous prime is 72061105511. The next prime is 72061105577. The reversal of 72061105520 is 2550116027.

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.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1999016 + ... + 2034744.

It is an arithmetic number, because the mean of its divisors is an integer number (2219025942).

Almost surely, 2^72061105520 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 72061105520, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (88761037680).

72061105520 is an abundant number, since it is smaller than the sum of its proper divisors (105460969840).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

72061105520 is a wasteful number, since it uses less digits than its factorization.

72061105520 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 37242 (or 37236 counting only the distinct ones).

The product of its (nonzero) digits is 4200, while the sum is 29.

The spelling of 72061105520 in words is "seventy-two billion, sixty-one million, one hundred five thousand, five hundred twenty".