28238388 has 48 divisors (see below), whose sum is σ = 69503616. Its totient is φ = 8905600.

The previous prime is 28238387. The next prime is 28238393. The reversal of 28238388 is 88383282.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28238387) 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 15 ways as a sum of consecutive naturals, for example, 27370 + ... + 28382.

It is an arithmetic number, because the mean of its divisors is an integer number (1447992).

Almost surely, 2^28238388 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 28238388, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (34751808).

28238388 is an abundant number, since it is smaller than the sum of its proper divisors (41265228).

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

28238388 is a wasteful number, since it uses less digits than its factorization.

28238388 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1144 (or 1142 counting only the distinct ones).

The product of its digits is 147456, while the sum is 42.

The square root of 28238388 is about 5313.9804290193. The cubic root of 28238388 is about 304.5182325196.

It can be divided in two parts, 2823 and 8388, that added together give a palindrome (11211).

The spelling of 28238388 in words is "twenty-eight million, two hundred thirty-eight thousand, three hundred eighty-eight".