28173445 has 16 divisors (see below), whose sum is σ = 34898688. Its totient is φ = 21822400.

The previous prime is 28173427. The next prime is 28173449. The reversal of 28173445 is 54437182.

It is not a de Polignac number, because 28173445 - 2²¹ = 26076293 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 28173445.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28173449) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 23142 + ... + 24328.

It is an arithmetic number, because the mean of its divisors is an integer number (2181168).

Almost surely, 2^28173445 is an apocalyptic number.

It is an amenable number.

28173445 is a deficient number, since it is larger than the sum of its proper divisors (6725243).

28173445 is a wasteful number, since it uses less digits than its factorization.

28173445 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1340.

The product of its digits is 26880, while the sum is 34.

The square root of 28173445 is about 5307.8663321527. The cubic root of 28173445 is about 304.2846083766.

The spelling of 28173445 in words is "twenty-eight million, one hundred seventy-three thousand, four hundred forty-five".