28138203 has 12 divisors (see below), whose sum is σ = 40918800. Its totient is φ = 18632016.

The previous prime is 28138199. The next prime is 28138217. The reversal of 28138203 is 30283182.

28138203 is a `hidden beast` number, since 281 + 382 + 0 + 3 = 666.

It is not a de Polignac number, because 28138203 - 2² = 28138199 is a prime.

It is not an unprimeable number, because it can be changed into a prime (28138273) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 9151 + ... + 11832.

It is an arithmetic number, because the mean of its divisors is an integer number (3409900).

Almost surely, 2^28138203 is an apocalyptic number.

28138203 is a deficient number, since it is larger than the sum of its proper divisors (12780597).

28138203 is a wasteful number, since it uses less digits than its factorization.

28138203 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 21138 (or 21135 counting only the distinct ones).

The product of its (nonzero) digits is 2304, while the sum is 27.

The square root of 28138203 is about 5304.5455036223. The cubic root of 28138203 is about 304.1576794826.

The spelling of 28138203 in words is "twenty-eight million, one hundred thirty-eight thousand, two hundred three".