28271087 has 4 divisors (see below), whose sum is σ = 30445800. Its totient is φ = 26096376.

The previous prime is 28271057. The next prime is 28271137. The reversal of 28271087 is 78017282.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 28271087 - 2⁸ = 28270831 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 (28271057) 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 3 ways as a sum of consecutive naturals, for example, 1087337 + ... + 1087362.

It is an arithmetic number, because the mean of its divisors is an integer number (7611450).

Almost surely, 2^28271087 is an apocalyptic number.

28271087 is a deficient number, since it is larger than the sum of its proper divisors (2174713).

28271087 is a wasteful number, since it uses less digits than its factorization.

28271087 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2174712.

The product of its (nonzero) digits is 12544, while the sum is 35.

The square root of 28271087 is about 5317.0562344214. The cubic root of 28271087 is about 304.6357274312.

The spelling of 28271087 in words is "twenty-eight million, two hundred seventy-one thousand, eighty-seven".