28003033 has 4 divisors (see below), whose sum is σ = 28073268. Its totient is φ = 27932800.

The previous prime is 28003021. The next prime is 28003037. The reversal of 28003033 is 33030082.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 15976009 + 12027024 = 3997^2 + 3468^2 .

It is a cyclic number.

It is not a de Polignac number, because 28003033 - 2²¹ = 25905881 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 28003033.

It is not an unprimeable number, because it can be changed into a prime (28003037) 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, 34516 + ... + 35317.

It is an arithmetic number, because the mean of its divisors is an integer number (7018317).

Almost surely, 2^28003033 is an apocalyptic number.

It is an amenable number.

28003033 is a deficient number, since it is larger than the sum of its proper divisors (70235).

28003033 is an equidigital number, since it uses as much as digits as its factorization.

28003033 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 70234.

The product of its (nonzero) digits is 432, while the sum is 19.

The square root of 28003033 is about 5291.7892059303. The cubic root of 28003033 is about 303.6698610469.

The spelling of 28003033 in words is "twenty-eight million, three thousand, thirty-three".