28122688 has 56 divisors (see below), whose sum is σ = 62362080. Its totient is φ = 12472320.

The previous prime is 28122683. The next prime is 28122691. The reversal of 28122688 is 88622182.

It is not an unprimeable number, because it can be changed into a prime (28122683) by changing a digit.

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, 29808 + ... + 30736.

Almost surely, 2^28122688 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 28122688, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (31181040).

28122688 is an abundant number, since it is smaller than the sum of its proper divisors (34239392).

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

28122688 is a wasteful number, since it uses less digits than its factorization.

28122688 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 995 (or 985 counting only the distinct ones).

The product of its digits is 24576, while the sum is 37.

The square root of 28122688 is about 5303.0828769688. The cubic root of 28122688 is about 304.1017664831.

The spelling of 28122688 in words is "twenty-eight million, one hundred twenty-two thousand, six hundred eighty-eight".