28227138 has 16 divisors (see below), whose sum is σ = 57135456. Its totient is φ = 9295520.

The previous prime is 28227137. The next prime is 28227139. The reversal of 28227138 is 83172282.

It is an interprime number because it is at equal distance from previous prime (28227137) and next prime (28227139).

It is a junction number, because it is equal to n+sod(n) for n = 28227099 and 28227108.

It is not an unprimeable number, because it can be changed into a prime (28227137) 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 7 ways as a sum of consecutive naturals, for example, 27843 + ... + 28838.

It is an arithmetic number, because the mean of its divisors is an integer number (3570966).

Almost surely, 2^28227138 is an apocalyptic number.

28227138 is an abundant number, since it is smaller than the sum of its proper divisors (28908318).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

28227138 is a wasteful number, since it uses less digits than its factorization.

28227138 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 56769.

The product of its digits is 10752, while the sum is 33.

The square root of 28227138 is about 5312.9217950201. The cubic root of 28227138 is about 304.4777877515.

The spelling of 28227138 in words is "twenty-eight million, two hundred twenty-seven thousand, one hundred thirty-eight".