28070003 has 4 divisors (see below), whose sum is σ = 30229248. Its totient is φ = 25910760.

The previous prime is 28069997. The next prime is 28070047. The reversal of 28070003 is 30007082.

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 28070003 - 2⁸ = 28069747 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (28070093) 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, 1079603 + ... + 1079628.

It is an arithmetic number, because the mean of its divisors is an integer number (7557312).

Almost surely, 2^28070003 is an apocalyptic number.

28070003 is a deficient number, since it is larger than the sum of its proper divisors (2159245).

28070003 is a wasteful number, since it uses less digits than its factorization.

28070003 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2159244.

The product of its (nonzero) digits is 336, while the sum is 20.

The square root of 28070003 is about 5298.1131546995. The cubic root of 28070003 is about 303.9117465136.

Adding to 28070003 its reverse (30007082), we get a palindrome (58077085).

The spelling of 28070003 in words is "twenty-eight million, seventy thousand, three".