28288338 has 32 divisors (see below), whose sum is σ = 61849536. Its totient is φ = 8572608.

The previous prime is 28288331. The next prime is 28288363. The reversal of 28288338 is 83388282.

It is a self number, because there is not a number n which added to its sum of digits gives 28288338.

It is not an unprimeable number, because it can be changed into a prime (28288331) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 2520 + ... + 7932.

It is an arithmetic number, because the mean of its divisors is an integer number (1932798).

Almost surely, 2^28288338 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 28288338, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (30924768).

28288338 is an abundant number, since it is smaller than the sum of its proper divisors (33561198).

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

28288338 is a wasteful number, since it uses less digits than its factorization.

28288338 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5498.

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

The square root of 28288338 is about 5318.6782192571. The cubic root of 28288338 is about 304.6976776771.

The spelling of 28288338 in words is "twenty-eight million, two hundred eighty-eight thousand, three hundred thirty-eight".