72097172 has 48 divisors (see below), whose sum is σ = 154707840. Its totient is φ = 28708992.

The previous prime is 72097171. The next prime is 72097177. The reversal of 72097172 is 27179027.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (72097171) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 26918 + ... + 29474.

It is an arithmetic number, because the mean of its divisors is an integer number (3223080).

Almost surely, 2^72097172 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 72097172, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (77353920).

72097172 is an abundant number, since it is smaller than the sum of its proper divisors (82610668).

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

72097172 is a wasteful number, since it uses less digits than its factorization.

72097172 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2640 (or 2638 counting only the distinct ones).

The product of its (nonzero) digits is 12348, while the sum is 35.

The square root of 72097172 is about 8491.0053586133. The cubic root of 72097172 is about 416.2038340946.

The spelling of 72097172 in words is "seventy-two million, ninety-seven thousand, one hundred seventy-two".