28812803 has 4 divisors (see below), whose sum is σ = 28891680. Its totient is φ = 28733928.

The previous prime is 28812799. The next prime is 28812821. The reversal of 28812803 is 30821882.

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 28812803 - 2² = 28812799 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 28812803.

It is not an unprimeable number, because it can be changed into a prime (28812403) 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, 38888 + ... + 39621.

It is an arithmetic number, because the mean of its divisors is an integer number (7222920).

Almost surely, 2^28812803 is an apocalyptic number.

28812803 is a deficient number, since it is larger than the sum of its proper divisors (78877).

28812803 is an equidigital number, since it uses as much as digits as its factorization.

28812803 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 78876.

The product of its (nonzero) digits is 6144, while the sum is 32.

The square root of 28812803 is about 5367.7558625556. The cubic root of 28812803 is about 306.5691878009.

The spelling of 28812803 in words is "twenty-eight million, eight hundred twelve thousand, eight hundred three".