28686328 has 32 divisors (see below), whose sum is σ = 59033520. Its totient is φ = 12960000.

The previous prime is 28686271. The next prime is 28686367. The reversal of 28686328 is 82368682.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 15028 + ... + 16828.

Almost surely, 2^28686328 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 28686328, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (29516760).

28686328 is an abundant number, since it is smaller than the sum of its proper divisors (30347192).

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

28686328 is a wasteful number, since it uses less digits than its factorization.

28686328 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1999 (or 1995 counting only the distinct ones).

The product of its digits is 221184, while the sum is 43.

The square root of 28686328 is about 5355.9619117391. The cubic root of 28686328 is about 306.1199637855.

The spelling of 28686328 in words is "twenty-eight million, six hundred eighty-six thousand, three hundred twenty-eight".