28136928 has 24 divisors (see below), whose sum is σ = 73859688. Its totient is φ = 9378944.

The previous prime is 28136903. The next prime is 28136951. The reversal of 28136928 is 82963182.

It is a happy number.

It is a tau number, because it is divible by the number of its divisors (24).

It is a Smith number, since the sum of its digits (39) coincides with the sum of the digits of its prime factors.

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, 146451 + ... + 146642.

It is an arithmetic number, because the mean of its divisors is an integer number (3077487).

Almost surely, 2^28136928 is an apocalyptic number.

It is an amenable number.

28136928 is an abundant number, since it is smaller than the sum of its proper divisors (45722760).

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

28136928 is a wasteful number, since it uses less digits than its factorization.

28136928 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 293106 (or 293098 counting only the distinct ones).

The product of its digits is 41472, while the sum is 39.

The square root of 28136928 is about 5304.4253223134. The cubic root of 28136928 is about 304.1530854093.

The spelling of 28136928 in words is "twenty-eight million, one hundred thirty-six thousand, nine hundred twenty-eight".