28288208 has 40 divisors (see below), whose sum is σ = 59350368. Its totient is φ = 12984192.

The previous prime is 28288193. The next prime is 28288231. The reversal of 28288208 is 80288282.

It is a congruent number.

It is an unprimeable number.

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, 63635 + ... + 64077.

Almost surely, 2^28288208 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 28288208, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (29675184).

28288208 is an abundant number, since it is smaller than the sum of its proper divisors (31062160).

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

28288208 is a wasteful number, since it uses less digits than its factorization.

28288208 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 771 (or 765 counting only the distinct ones).

The product of its (nonzero) digits is 32768, while the sum is 38.

The square root of 28288208 is about 5318.6659981616. The cubic root of 28288208 is about 304.6972109270.

The spelling of 28288208 in words is "twenty-eight million, two hundred eighty-eight thousand, two hundred eight".