28558287 has 12 divisors (see below), whose sum is σ = 41328144. Its totient is φ = 19003200.

The previous prime is 28558247. The next prime is 28558289. The reversal of 28558287 is 78285582.

It is a de Polignac number, because none of the positive numbers 2^k-28558287 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28558289) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 2662 + ... + 8012.

It is an arithmetic number, because the mean of its divisors is an integer number (3444012).

Almost surely, 2^28558287 is an apocalyptic number.

28558287 is a deficient number, since it is larger than the sum of its proper divisors (12769857).

28558287 is a wasteful number, since it uses less digits than its factorization.

28558287 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5950 (or 5947 counting only the distinct ones).

The product of its digits is 358400, while the sum is 45.

The square root of 28558287 is about 5343.9954154172. The cubic root of 28558287 is about 305.6638304885.

The spelling of 28558287 in words is "twenty-eight million, five hundred fifty-eight thousand, two hundred eighty-seven".