28089403 has 4 divisors (see below), whose sum is σ = 28100088. Its totient is φ = 28078720.

The previous prime is 28089377. The next prime is 28089419. The reversal of 28089403 is 30498082.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It is a cyclic number.

It is not a de Polignac number, because 28089403 - 2²¹ = 25992251 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (28089443) 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, 1668 + ... + 7678.

It is an arithmetic number, because the mean of its divisors is an integer number (7025022).

Almost surely, 2^28089403 is an apocalyptic number.

28089403 is a deficient number, since it is larger than the sum of its proper divisors (10685).

28089403 is an equidigital number, since it uses as much as digits as its factorization.

28089403 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10684.

The product of its (nonzero) digits is 13824, while the sum is 34.

The square root of 28089403 is about 5299.9436789460. The cubic root of 28089403 is about 303.9817444889.

The spelling of 28089403 in words is "twenty-eight million, eighty-nine thousand, four hundred three".