72173721172 has 48 divisors (see below), whose sum is σ = 147113366400. Its totient is φ = 30339234432.

The previous prime is 72173721167. The next prime is 72173721239. The reversal of 72173721172 is 27112737127.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 9370579 + ... + 9378277.

It is an arithmetic number, because the mean of its divisors is an integer number (3064861800).

Almost surely, 2^72173721172 is an apocalyptic number.

It is an amenable number.

72173721172 is an abundant number, since it is smaller than the sum of its proper divisors (74939645228).

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

72173721172 is a wasteful number, since it uses less digits than its factorization.

72173721172 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 14080 (or 14078 counting only the distinct ones).

The product of its digits is 57624, while the sum is 40.

The spelling of 72173721172 in words is "seventy-two billion, one hundred seventy-three million, seven hundred twenty-one thousand, one hundred seventy-two".