28084287 has 16 divisors (see below), whose sum is σ = 46685952. Its totient is φ = 14589120.

The previous prime is 28084283. The next prime is 28084307. The reversal of 28084287 is 78248082.

It is not a de Polignac number, because 28084287 - 2² = 28084283 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28084283) 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 15 ways as a sum of consecutive naturals, for example, 60558 + ... + 61019.

It is an arithmetic number, because the mean of its divisors is an integer number (2917872).

Almost surely, 2^28084287 is an apocalyptic number.

28084287 is a deficient number, since it is larger than the sum of its proper divisors (18601665).

28084287 is a wasteful number, since it uses less digits than its factorization.

28084287 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 121598.

The product of its (nonzero) digits is 57344, while the sum is 39.

The square root of 28084287 is about 5299.4610103293. The cubic root of 28084287 is about 303.9632883588.

The spelling of 28084287 in words is "twenty-eight million, eighty-four thousand, two hundred eighty-seven".