28089903 has 4 divisors (see below), whose sum is σ = 37453208. Its totient is φ = 18726600.

The previous prime is 28089883. The next prime is 28089907. The reversal of 28089903 is 30998082.

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

It is not a de Polignac number, because 28089903 - 2¹² = 28085807 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 (28089907) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 4681648 + ... + 4681653.

It is an arithmetic number, because the mean of its divisors is an integer number (9363302).

Almost surely, 2^28089903 is an apocalyptic number.

28089903 is a deficient number, since it is larger than the sum of its proper divisors (9363305).

28089903 is an equidigital number, since it uses as much as digits as its factorization.

28089903 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9363304.

The product of its (nonzero) digits is 31104, while the sum is 39.

The square root of 28089903 is about 5299.9908490487. The cubic root of 28089903 is about 303.9835481344.

The spelling of 28089903 in words is "twenty-eight million, eighty-nine thousand, nine hundred three".