28745871587173 has 6 divisors (see below), whose sum is σ = 31127186393394. Its totient is φ = 26534650695696.

The previous prime is 28745871587117. The next prime is 28745871587203. The reversal of 28745871587173 is 37178517854782.

It is a happy number.

It can be written as a sum of positive squares in 3 ways, for example, as 3438361735524 + 25307509851649 = 1854282^2 + 5030657^2 .

It is not a de Polignac number, because 28745871587173 - 2²⁵ = 28745838032741 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 28745871587096 and 28745871587105.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28745871587113) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 85046957190 + ... + 85046957527.

It is an arithmetic number, because the mean of its divisors is an integer number (5187864398899).

Almost surely, 2^{28745871587173} is an apocalyptic number.

It is an amenable number.

28745871587173 is a deficient number, since it is larger than the sum of its proper divisors (2381314806221).

28745871587173 is a wasteful number, since it uses less digits than its factorization.

28745871587173 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 170093914743 (or 170093914730 counting only the distinct ones).

The product of its digits is 737587200, while the sum is 73.

The spelling of 28745871587173 in words is "twenty-eight trillion, seven hundred forty-five billion, eight hundred seventy-one million, five hundred eighty-seven thousand, one hundred seventy-three".