28440803 has 4 divisors (see below), whose sum is σ = 28483128. Its totient is φ = 28398480.

The previous prime is 28440791. The next prime is 28440821. The reversal of 28440803 is 30804482.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 30804482 = 2 ⋅15402241.

It is a cyclic number.

It is not a de Polignac number, because 28440803 - 2²⁰ = 27392227 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (28440833) 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, 20138 + ... + 21503.

It is an arithmetic number, because the mean of its divisors is an integer number (7120782).

Almost surely, 2^28440803 is an apocalyptic number.

28440803 is a deficient number, since it is larger than the sum of its proper divisors (42325).

28440803 is an equidigital number, since it uses as much as digits as its factorization.

28440803 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 42324.

The product of its (nonzero) digits is 6144, while the sum is 29.

The square root of 28440803 is about 5332.9919369900. The cubic root of 28440803 is about 305.2441045000.

The spelling of 28440803 in words is "twenty-eight million, four hundred forty thousand, eight hundred three".