28089373 has 4 divisors (see below), whose sum is σ = 30250108. Its totient is φ = 25928640.

The previous prime is 28089367. The next prime is 28089377. The reversal of 28089373 is 37398082.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 37398082 = 2 ⋅18699041.

It can be written as a sum of positive squares in 2 ways, for example, as 13816089 + 14273284 = 3717^2 + 3778^2 .

It is a cyclic number.

It is not a de Polignac number, because 28089373 - 2⁹ = 28088861 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 (28089377) 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, 1080348 + ... + 1080373.

It is an arithmetic number, because the mean of its divisors is an integer number (7562527).

Almost surely, 2^28089373 is an apocalyptic number.

It is an amenable number.

28089373 is a deficient number, since it is larger than the sum of its proper divisors (2160735).

28089373 is a wasteful number, since it uses less digits than its factorization.

28089373 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2160734.

The product of its (nonzero) digits is 72576, while the sum is 40.

The square root of 28089373 is about 5299.9408487265. The cubic root of 28089373 is about 303.9816362695.

The spelling of 28089373 in words is "twenty-eight million, eighty-nine thousand, three hundred seventy-three".