28321803 has 6 divisors (see below), whose sum is σ = 40909284. Its totient is φ = 18881196.

The previous prime is 28321801. The next prime is 28321819. The reversal of 28321803 is 30812382.

It is not a de Polignac number, because 28321803 - 2¹ = 28321801 is a prime.

It is not an unprimeable number, because it can be changed into a prime (28321801) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 1573425 + ... + 1573442.

It is an arithmetic number, because the mean of its divisors is an integer number (6818214).

Almost surely, 2^28321803 is an apocalyptic number.

28321803 is a deficient number, since it is larger than the sum of its proper divisors (12587481).

28321803 is a wasteful number, since it uses less digits than its factorization.

28321803 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3146873 (or 3146870 counting only the distinct ones).

The product of its (nonzero) digits is 2304, while the sum is 27.

The square root of 28321803 is about 5321.8232777874. The cubic root of 28321803 is about 304.8177824064.

The spelling of 28321803 in words is "twenty-eight million, three hundred twenty-one thousand, eight hundred three".