72011721500 has 24 divisors (see below), whose sum is σ = 157273600848. Its totient is φ = 28804688400.

The previous prime is 72011721497. The next prime is 72011721511. The reversal of 72011721500 is 512711027.

It is a self number, because there is not a number n which added to its sum of digits gives 72011721500.

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 7 ways as a sum of consecutive naturals, for example, 72011222 + ... + 72012221.

It is an arithmetic number, because the mean of its divisors is an integer number (6553066702).

Almost surely, 2^72011721500 is an apocalyptic number.

It is an amenable number.

72011721500 is an abundant number, since it is smaller than the sum of its proper divisors (85261879348).

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

72011721500 is a wasteful number, since it uses less digits than its factorization.

72011721500 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 144023462 (or 144023450 counting only the distinct ones).

The product of its (nonzero) digits is 980, while the sum is 26.

The spelling of 72011721500 in words is "seventy-two billion, eleven million, seven hundred twenty-one thousand, five hundred".