28173844 has 12 divisors (see below), whose sum is σ = 49813204. Its totient is φ = 13941504.

The previous prime is 28173841. The next prime is 28173851. The reversal of 28173844 is 44837182.

It can be written as a sum of positive squares in 2 ways, for example, as 17740944 + 10432900 = 4212^2 + 3230^2 .

It is a hoax number, since the sum of its digits (37) coincides with the sum of the digits of its distinct prime factors.

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

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 35919 + ... + 36694.

Almost surely, 2^28173844 is an apocalyptic number.

It is an amenable number.

28173844 is a deficient number, since it is larger than the sum of its proper divisors (21639360).

28173844 is a wasteful number, since it uses less digits than its factorization.

28173844 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 72714 (or 72712 counting only the distinct ones).

The product of its digits is 43008, while the sum is 37.

The square root of 28173844 is about 5307.9039177438. The cubic root of 28173844 is about 304.2860448236.

The spelling of 28173844 in words is "twenty-eight million, one hundred seventy-three thousand, eight hundred forty-four".