28129088 has 28 divisors (see below), whose sum is σ = 60114180. Its totient is φ = 12982272.

The previous prime is 28129021. The next prime is 28129091. The reversal of 28129088 is 88092182.

It can be written as a sum of positive squares in 2 ways, for example, as 9535744 + 18593344 = 3088^2 + 4312^2 .

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 16073 + ... + 17736.

It is an arithmetic number, because the mean of its divisors is an integer number (2146935).

Almost surely, 2^28129088 is an apocalyptic number.

It is an amenable number.

28129088 is an abundant number, since it is smaller than the sum of its proper divisors (31985092).

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

28129088 is a wasteful number, since it uses less digits than its factorization.

28129088 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 33834 (or 33824 counting only the distinct ones).

The product of its (nonzero) digits is 18432, while the sum is 38.

The square root of 28129088 is about 5303.6862652310. The cubic root of 28129088 is about 304.1248333118.

The spelling of 28129088 in words is "twenty-eight million, one hundred twenty-nine thousand, eighty-eight".