28003073 has 4 divisors (see below), whose sum is σ = 32003520. Its totient is φ = 24002628.

The previous prime is 28003069. The next prime is 28003099. The reversal of 28003073 is 37030082.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 37030082 = 2 ⋅18515041.

It is a cyclic number.

It is not a de Polignac number, because 28003073 - 2² = 28003069 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (28003273) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2000213 + ... + 2000226.

It is an arithmetic number, because the mean of its divisors is an integer number (8000880).

Almost surely, 2^28003073 is an apocalyptic number.

It is an amenable number.

28003073 is a deficient number, since it is larger than the sum of its proper divisors (4000447).

28003073 is an equidigital number, since it uses as much as digits as its factorization.

28003073 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4000446.

The product of its (nonzero) digits is 1008, while the sum is 23.

The square root of 28003073 is about 5291.7929853689. The cubic root of 28003073 is about 303.6700056358.

The spelling of 28003073 in words is "twenty-eight million, three thousand, seventy-three".