28912803 has 4 divisors (see below), whose sum is σ = 38550408. Its totient is φ = 19275200.

The previous prime is 28912789. The next prime is 28912811. The reversal of 28912803 is 30821982.

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

It is a cyclic number.

It is not a de Polignac number, because 28912803 - 2¹⁸ = 28650659 is a prime.

It is not an unprimeable number, because it can be changed into a prime (28912843) 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, 4818798 + ... + 4818803.

It is an arithmetic number, because the mean of its divisors is an integer number (9637602).

Almost surely, 2^28912803 is an apocalyptic number.

28912803 is a deficient number, since it is larger than the sum of its proper divisors (9637605).

28912803 is an equidigital number, since it uses as much as digits as its factorization.

28912803 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9637604.

The product of its (nonzero) digits is 6912, while the sum is 33.

The square root of 28912803 is about 5377.0626739885. The cubic root of 28912803 is about 306.9234460593.

The spelling of 28912803 in words is "twenty-eight million, nine hundred twelve thousand, eight hundred three".