28328256 has 168 divisors, whose sum is σ = 94146624. Its totient is φ = 8048640.

The previous prime is 28328243. The next prime is 28328257. The reversal of 28328256 is 65282382.

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

It is a self number, because there is not a number n which added to its sum of digits gives 28328256.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28328257) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 107581 + ... + 107843.

Almost surely, 2^28328256 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 28328256, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (47073312).

28328256 is an abundant number, since it is smaller than the sum of its proper divisors (65818368).

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

28328256 is a wasteful number, since it uses less digits than its factorization.

28328256 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 309 (or 296 counting only the distinct ones).

The product of its digits is 46080, while the sum is 36.

The square root of 28328256 is about 5322.4295204352. The cubic root of 28328256 is about 304.8409311184.

The spelling of 28328256 in words is "twenty-eight million, three hundred twenty-eight thousand, two hundred fifty-six".