28001003 has 4 divisors (see below), whose sum is σ = 29474760. Its totient is φ = 26527248.

The previous prime is 28000981. The next prime is 28001009. The reversal of 28001003 is 30010082.

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 28001003 - 2⁶ = 28000939 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (28001009) 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, 736850 + ... + 736887.

It is an arithmetic number, because the mean of its divisors is an integer number (7368690).

Almost surely, 2^28001003 is an apocalyptic number.

28001003 is a deficient number, since it is larger than the sum of its proper divisors (1473757).

28001003 is a wasteful number, since it uses less digits than its factorization.

28001003 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1473756.

The product of its (nonzero) digits is 48, while the sum is 14.

The square root of 28001003 is about 5291.5973958721. The cubic root of 28001003 is about 303.6625229761.

Adding to 28001003 its reverse (30010082), we get a palindrome (58011085).

The spelling of 28001003 in words is "twenty-eight million, one thousand, three".