28428203 has 4 divisors (see below), whose sum is σ = 29089368. Its totient is φ = 27767040.

The previous prime is 28428163. The next prime is 28428217. The reversal of 28428203 is 30282482.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 30282482 = 2 ⋅15141241.

It is a cyclic number.

It is not a de Polignac number, because 28428203 - 2⁸ = 28427947 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (28428223) 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, 330518 + ... + 330603.

It is an arithmetic number, because the mean of its divisors is an integer number (7272342).

Almost surely, 2^28428203 is an apocalyptic number.

28428203 is a deficient number, since it is larger than the sum of its proper divisors (661165).

28428203 is an equidigital number, since it uses as much as digits as its factorization.

28428203 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 661164.

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

The square root of 28428203 is about 5331.8104805028. The cubic root of 28428203 is about 305.1990208711.

The spelling of 28428203 in words is "twenty-eight million, four hundred twenty-eight thousand, two hundred three".