72173287932 has 24 divisors (see below), whose sum is σ = 168408683856. Its totient is φ = 24057141888.

The previous prime is 72173287829. The next prime is 72173287939. The reversal of 72173287932 is 23978237127.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (72173287939) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 860368 + ... + 940520.

It is an arithmetic number, because the mean of its divisors is an integer number (7017028494).

Almost surely, 2^72173287932 is an apocalyptic number.

It is an amenable number.

72173287932 is an abundant number, since it is smaller than the sum of its proper divisors (96235395924).

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

72173287932 is a wasteful number, since it uses less digits than its factorization.

72173287932 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 155197 (or 155195 counting only the distinct ones).

The product of its digits is 1778112, while the sum is 51.

The spelling of 72173287932 in words is "seventy-two billion, one hundred seventy-three million, two hundred eighty-seven thousand, nine hundred thirty-two".