28890203 has 4 divisors (see below), whose sum is σ = 30410760. Its totient is φ = 27369648.

The previous prime is 28890187. The next prime is 28890263. The reversal of 28890203 is 30209882.

It is a happy number.

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 28890203 - 2⁴ = 28890187 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 28890203.

It is not an unprimeable number, because it can be changed into a prime (28890263) 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, 760250 + ... + 760287.

It is an arithmetic number, because the mean of its divisors is an integer number (7602690).

Almost surely, 2^28890203 is an apocalyptic number.

28890203 is a deficient number, since it is larger than the sum of its proper divisors (1520557).

28890203 is a wasteful number, since it uses less digits than its factorization.

28890203 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1520556.

The product of its (nonzero) digits is 6912, while the sum is 32.

The square root of 28890203 is about 5374.9607440427. The cubic root of 28890203 is about 306.8434552217.

The spelling of 28890203 in words is "twenty-eight million, eight hundred ninety thousand, two hundred three".