28100903 has 4 divisors (see below), whose sum is σ = 28218720. Its totient is φ = 27983088.

The previous prime is 28100893. The next prime is 28100921. The reversal of 28100903 is 30900182.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 30900182 = 2 ⋅15450091.

It is a cyclic number.

It is not a de Polignac number, because 28100903 - 2²⁰ = 27052327 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28100603) 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, 58550 + ... + 59027.

It is an arithmetic number, because the mean of its divisors is an integer number (7054680).

Almost surely, 2^28100903 is an apocalyptic number.

28100903 is a deficient number, since it is larger than the sum of its proper divisors (117817).

28100903 is a wasteful number, since it uses less digits than its factorization.

28100903 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 117816.

The product of its (nonzero) digits is 432, while the sum is 23.

The square root of 28100903 is about 5301.0284851149. The cubic root of 28100903 is about 304.0232229201.

The spelling of 28100903 in words is "twenty-eight million, one hundred thousand, nine hundred three".