28870203 has 4 divisors (see below), whose sum is σ = 38493608. Its totient is φ = 19246800.

The previous prime is 28870189. The next prime is 28870211. The reversal of 28870203 is 30207882.

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

It is not a de Polignac number, because 28870203 - 2⁸ = 28869947 is a prime.

It is a super-2 number, since 2×28870203² = 1666977242522418, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (28870103) 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, 4811698 + ... + 4811703.

It is an arithmetic number, because the mean of its divisors is an integer number (9623402).

Almost surely, 2^28870203 is an apocalyptic number.

28870203 is a deficient number, since it is larger than the sum of its proper divisors (9623405).

28870203 is an equidigital number, since it uses as much as digits as its factorization.

28870203 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9623404.

The product of its (nonzero) digits is 5376, while the sum is 30.

The square root of 28870203 is about 5373.0999432357. The cubic root of 28870203 is about 306.7726320689.

The spelling of 28870203 in words is "twenty-eight million, eight hundred seventy thousand, two hundred three".