28123168 has 36 divisors (see below), whose sum is σ = 58835322. Its totient is φ = 13230080.

The previous prime is 28123163. The next prime is 28123187. The reversal of 28123168 is 86132182.

It can be written as a sum of positive squares in 3 ways, for example, as 26749584 + 1373584 = 5172^2 + 1172^2 .

It is not an unprimeable number, because it can be changed into a prime (28123163) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 7728 + ... + 10768.

Almost surely, 2^28123168 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 28123168, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (29417661).

28123168 is an abundant number, since it is smaller than the sum of its proper divisors (30712154).

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

28123168 is a wasteful number, since it uses less digits than its factorization.

28123168 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3085 (or 3060 counting only the distinct ones).

The product of its digits is 4608, while the sum is 31.

The square root of 28123168 is about 5303.1281334699. The cubic root of 28123168 is about 304.1034966166.

The spelling of 28123168 in words is "twenty-eight million, one hundred twenty-three thousand, one hundred sixty-eight".