28136523 has 8 divisors (see below), whose sum is σ = 37540048. Its totient is φ = 18745344.

The previous prime is 28136489. The next prime is 28136531. The reversal of 28136523 is 32563182.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 28136523 - 2⁸ = 28136267 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (28136123) by changing a digit.

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 7 ways as a sum of consecutive naturals, for example, 6411 + ... + 9867.

It is an arithmetic number, because the mean of its divisors is an integer number (4692506).

Almost surely, 2^28136523 is an apocalyptic number.

28136523 is a deficient number, since it is larger than the sum of its proper divisors (9403525).

28136523 is a wasteful number, since it uses less digits than its factorization.

28136523 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6173.

The product of its digits is 8640, while the sum is 30.

The square root of 28136523 is about 5304.3871465043. The cubic root of 28136523 is about 304.1516260864.

The spelling of 28136523 in words is "twenty-eight million, one hundred thirty-six thousand, five hundred twenty-three".