28688328 has 96 divisors (see below), whose sum is σ = 83272800. Its totient is φ = 8895744.

The previous prime is 28688323. The next prime is 28688371. The reversal of 28688328 is 82388682.

It is a nude number because it is divisible by every one of its digits.

It is not an unprimeable number, because it can be changed into a prime (28688321) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 91500 + ... + 91812.

It is an arithmetic number, because the mean of its divisors is an integer number (867425).

Almost surely, 2^28688328 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 28688328, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (41636400).

28688328 is an abundant number, since it is smaller than the sum of its proper divisors (54584472).

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

28688328 is a wasteful number, since it uses less digits than its factorization.

28688328 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 411 (or 404 counting only the distinct ones).

The product of its digits is 294912, while the sum is 45.

The square root of 28688328 is about 5356.1486163100. The cubic root of 28688328 is about 306.1270778097.

The spelling of 28688328 in words is "twenty-eight million, six hundred eighty-eight thousand, three hundred twenty-eight".