28355328 has 108 divisors (see below), whose sum is σ = 84605248. Its totient is φ = 9123840.

The previous prime is 28355309. The next prime is 28355339. The reversal of 28355328 is 82355382.

28355328 is a `hidden beast` number, since 2 + 83 + 553 + 28 = 666.

It is a Harshad number since it is a multiple of its sum of digits (36).

Its product of digits (57600) is a multiple of the sum of its prime factors (450).

It is a junction number, because it is equal to n+sod(n) for n = 28355292 and 28355301.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 71226 + ... + 71622.

Almost surely, 2^28355328 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 28355328, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (42302624).

28355328 is an abundant number, since it is smaller than the sum of its proper divisors (56249920).

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

28355328 is a wasteful number, since it uses less digits than its factorization.

28355328 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 450 (or 433 counting only the distinct ones).

The product of its digits is 57600, while the sum is 36.

The square root of 28355328 is about 5324.9721126030. The cubic root of 28355328 is about 304.9380076461.

It can be divided in two parts, 283 and 55328, that added together give a triangular number (55611 = T₃₃₃).

The spelling of 28355328 in words is "twenty-eight million, three hundred fifty-five thousand, three hundred twenty-eight".