28968173 has 4 divisors (see below), whose sum is σ = 31196508. Its totient is φ = 26739840.

The previous prime is 28968169. The next prime is 28968193. The reversal of 28968173 is 37186982.

28968173 is nontrivially palindromic in base 14.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 14122564 + 14845609 = 3758^2 + 3853^2 .

It is a cyclic number.

It is not a de Polignac number, because 28968173 - 2² = 28968169 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28968143) 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, 1114148 + ... + 1114173.

It is an arithmetic number, because the mean of its divisors is an integer number (7799127).

Almost surely, 2^28968173 is an apocalyptic number.

It is an amenable number.

28968173 is a deficient number, since it is larger than the sum of its proper divisors (2228335).

28968173 is a wasteful number, since it uses less digits than its factorization.

28968173 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2228334.

The product of its digits is 145152, while the sum is 44.

The square root of 28968173 is about 5382.2089331426. The cubic root of 28968173 is about 307.1192476019.

The spelling of 28968173 in words is "twenty-eight million, nine hundred sixty-eight thousand, one hundred seventy-three".