28328768 has 56 divisors (see below), whose sum is σ = 61447680. Its totient is φ = 12879360.

The previous prime is 28328767. The next prime is 28328771. The reversal of 28328768 is 86782382.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28328767) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 65513 + ... + 65943.

It is an arithmetic number, because the mean of its divisors is an integer number (1097280).

Almost surely, 2^28328768 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 28328768, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (30723840).

28328768 is an abundant number, since it is smaller than the sum of its proper divisors (33118912).

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

28328768 is a wasteful number, since it uses less digits than its factorization.

28328768 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 535 (or 525 counting only the distinct ones).

The product of its digits is 258048, while the sum is 44.

The square root of 28328768 is about 5322.4776185532. The cubic root of 28328768 is about 304.8427676547.

The spelling of 28328768 in words is "twenty-eight million, three hundred twenty-eight thousand, seven hundred sixty-eight".