28532287 has 8 divisors (see below), whose sum is σ = 32660000. Its totient is φ = 24417504.

The previous prime is 28532267. The next prime is 28532293. The reversal of 28532287 is 78223582.

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

It is a cyclic number.

It is not a de Polignac number, because 28532287 - 2¹¹ = 28530239 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28532227) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2089 + ... + 7837.

It is an arithmetic number, because the mean of its divisors is an integer number (4082500).

Almost surely, 2^28532287 is an apocalyptic number.

28532287 is a deficient number, since it is larger than the sum of its proper divisors (4127713).

28532287 is an equidigital number, since it uses as much as digits as its factorization.

28532287 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6465.

The product of its digits is 53760, while the sum is 37.

The square root of 28532287 is about 5341.5622246680. The cubic root of 28532287 is about 305.5710416296.

The spelling of 28532287 in words is "twenty-eight million, five hundred thirty-two thousand, two hundred eighty-seven".