28028003 has 4 divisors (see below), whose sum is σ = 28041048. Its totient is φ = 28014960.

The previous prime is 28027991. The next prime is 28028029. The reversal of 28028003 is 30082082.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 30082082 = 2 ⋅15041041.

It is a cyclic number.

It is not a de Polignac number, because 28028003 - 2¹⁰ = 28026979 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 28028003.

It is not an unprimeable number, because it can be changed into a prime (28021003) 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, 2453 + ... + 7878.

It is an arithmetic number, because the mean of its divisors is an integer number (7010262).

Almost surely, 2^28028003 is an apocalyptic number.

28028003 is a deficient number, since it is larger than the sum of its proper divisors (13045).

28028003 is a wasteful number, since it uses less digits than its factorization.

28028003 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13044.

The product of its (nonzero) digits is 768, while the sum is 23.

The square root of 28028003 is about 5294.1479956646. The cubic root of 28028003 is about 303.7600939366.

The spelling of 28028003 in words is "twenty-eight million, twenty-eight thousand, three".