72173061972 has 72 divisors (see below), whose sum is σ = 200993319072. Its totient is φ = 21654072000.

The previous prime is 72173061941. The next prime is 72173061979. The reversal of 72173061972 is 27916037127.

72173061972 is a `hidden beast` number, since 7 + 21 + 7 + 3 + 0 + 619 + 7 + 2 = 666.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (72173061979) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 862258 + ... + 942249.

It is an arithmetic number, because the mean of its divisors is an integer number (2791573876).

Almost surely, 2^72173061972 is an apocalyptic number.

It is an amenable number.

72173061972 is an abundant number, since it is smaller than the sum of its proper divisors (128820257100).

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

72173061972 is a wasteful number, since it uses less digits than its factorization.

72173061972 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1804629 (or 1804624 counting only the distinct ones).

The product of its (nonzero) digits is 222264, while the sum is 45.

The spelling of 72173061972 in words is "seventy-two billion, one hundred seventy-three million, sixty-one thousand, nine hundred seventy-two".