72173625844 has 12 divisors (see below), whose sum is σ = 126326760868. Its totient is φ = 36080265600.

The previous prime is 72173625841. The next prime is 72173625847. The reversal of 72173625844 is 44852637127.

It is an interprime number because it is at equal distance from previous prime (72173625841) and next prime (72173625847).

It can be written as a sum of positive squares in 2 ways, for example, as 12069219600 + 60104406244 = 109860^2 + 245162^2 .

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (72173625841) by changing a digit.

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 3 ways as a sum of consecutive naturals, for example, 1611987 + ... + 1656154.

Almost surely, 2^72173625844 is an apocalyptic number.

It is an amenable number.

72173625844 is a deficient number, since it is larger than the sum of its proper divisors (54153135024).

72173625844 is a wasteful number, since it uses less digits than its factorization.

72173625844 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3273666 (or 3273664 counting only the distinct ones).

The product of its digits is 2257920, while the sum is 49.

The spelling of 72173625844 in words is "seventy-two billion, one hundred seventy-three million, six hundred twenty-five thousand, eight hundred forty-four".