28432003 has 4 divisors (see below), whose sum is σ = 28491840. Its totient is φ = 28372168.

The previous prime is 28431971. The next prime is 28432013. The reversal of 28432003 is 30023482.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 30023482 = 2 ⋅15011741.

It is a cyclic number.

It is not a de Polignac number, because 28432003 - 2⁵ = 28431971 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (28432013) 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, 29200 + ... + 30157.

It is an arithmetic number, because the mean of its divisors is an integer number (7122960).

Almost surely, 2^28432003 is an apocalyptic number.

28432003 is a deficient number, since it is larger than the sum of its proper divisors (59837).

28432003 is an equidigital number, since it uses as much as digits as its factorization.

28432003 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 59836.

The product of its (nonzero) digits is 1152, while the sum is 22.

The square root of 28432003 is about 5332.1668203461. The cubic root of 28432003 is about 305.2126189238.

Adding to 28432003 its reverse (30023482), we get a palindrome (58455485).

The spelling of 28432003 in words is "twenty-eight million, four hundred thirty-two thousand, three".