28109673 has 10 divisors (see below), whose sum is σ = 41991114. Its totient is φ = 18739728.

The previous prime is 28109651. The next prime is 28109747. The reversal of 28109673 is 37690182.

It can be written as a sum of positive squares in only one way, i.e., 22924944 + 5184729 = 4788^2 + 2277^2 .

It is not a de Polignac number, because 28109673 - 2¹⁰ = 28108649 is a prime.

It is not an unprimeable number, because it can be changed into a prime (28101673) by changing a digit.

It is a polite number, since it can be written in 9 ways as a sum of consecutive naturals, for example, 173436 + ... + 173597.

Almost surely, 2^28109673 is an apocalyptic number.

It is an amenable number.

28109673 is a deficient number, since it is larger than the sum of its proper divisors (13881441).

28109673 is an equidigital number, since it uses as much as digits as its factorization.

28109673 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 347045 (or 347036 counting only the distinct ones).

The product of its (nonzero) digits is 18144, while the sum is 36.

The square root of 28109673 is about 5301.8556185547. The cubic root of 28109673 is about 304.0548471273.

It can be divided in two parts, 28109 and 673, that added together give a palindrome (28782).

The spelling of 28109673 in words is "twenty-eight million, one hundred nine thousand, six hundred seventy-three".