28112128 has 72 divisors (see below), whose sum is σ = 62546400. Its totient is φ = 12503040.

The previous prime is 28112113. The next prime is 28112131. The reversal of 28112128 is 82121182.

It is a nude number because it is divisible by every one of its digits.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 188598 + ... + 188746.

It is an arithmetic number, because the mean of its divisors is an integer number (868700).

Almost surely, 2^28112128 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 28112128, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (31273200).

28112128 is an abundant number, since it is smaller than the sum of its proper divisors (34434272).

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

28112128 is a wasteful number, since it uses less digits than its factorization.

28112128 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 243 (or 229 counting only the distinct ones).

The product of its digits is 512, while the sum is 25.

The square root of 28112128 is about 5302.0871362134. The cubic root of 28112128 is about 304.0636985634.

The spelling of 28112128 in words is "twenty-eight million, one hundred twelve thousand, one hundred twenty-eight".