28111328 has 24 divisors (see below), whose sum is σ = 63250992. Its totient is φ = 12047616.

The previous prime is 28111271. The next prime is 28111331. The reversal of 28111328 is 82311182.

It is a junction number, because it is equal to n+sod(n) for n = 28111297 and 28111306.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 62525 + ... + 62972.

It is an arithmetic number, because the mean of its divisors is an integer number (2635458).

Almost surely, 2^28111328 is an apocalyptic number.

28111328 is a gapful number since it is divisible by the number (28) formed by its first and last digit.

It is an amenable number.

28111328 is an abundant number, since it is smaller than the sum of its proper divisors (35139664).

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

28111328 is a wasteful number, since it uses less digits than its factorization.

28111328 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 125514 (or 125506 counting only the distinct ones).

The product of its digits is 768, while the sum is 26.

The square root of 28111328 is about 5302.0116936876. The cubic root of 28111328 is about 304.0608142416.

The spelling of 28111328 in words is "twenty-eight million, one hundred eleven thousand, three hundred twenty-eight".