28173845 has 16 divisors (see below), whose sum is σ = 40912128. Its totient is φ = 18182400.

The previous prime is 28173841. The next prime is 28173851. The reversal of 28173845 is 54837182.

It is not a de Polignac number, because 28173845 - 2² = 28173841 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 28173799 and 28173808.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28173841) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 23081 + ... + 24270.

It is an arithmetic number, because the mean of its divisors is an integer number (2557008).

Almost surely, 2^28173845 is an apocalyptic number.

It is an amenable number.

28173845 is a deficient number, since it is larger than the sum of its proper divisors (12738283).

28173845 is a wasteful number, since it uses less digits than its factorization.

28173845 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 47380.

The product of its digits is 53760, while the sum is 38.

The square root of 28173845 is about 5307.9040119429. The cubic root of 28173845 is about 304.2860484237.

The spelling of 28173845 in words is "twenty-eight million, one hundred seventy-three thousand, eight hundred forty-five".