28871903 has 4 divisors (see below), whose sum is σ = 28999320. Its totient is φ = 28744488.

The previous prime is 28871897. The next prime is 28871911. The reversal of 28871903 is 30917882.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 30917882 = 2 ⋅15458941.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-28871903 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 (28871993) 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, 63368 + ... + 63821.

It is an arithmetic number, because the mean of its divisors is an integer number (7249830).

Almost surely, 2^28871903 is an apocalyptic number.

28871903 is a deficient number, since it is larger than the sum of its proper divisors (127417).

28871903 is a wasteful number, since it uses less digits than its factorization.

28871903 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 127416.

The product of its (nonzero) digits is 24192, while the sum is 38.

The square root of 28871903 is about 5373.2581363638. The cubic root of 28871903 is about 306.7786533086.

The spelling of 28871903 in words is "twenty-eight million, eight hundred seventy-one thousand, nine hundred three".