28805287 has 6 divisors (see below), whose sum is σ = 33508248. Its totient is φ = 24690204.

The previous prime is 28805281. The next prime is 28805291. The reversal of 28805287 is 78250882.

It is not a de Polignac number, because 28805287 - 2¹¹ = 28803239 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 (28805281) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 293883 + ... + 293980.

It is an arithmetic number, because the mean of its divisors is an integer number (5584708).

Almost surely, 2^28805287 is an apocalyptic number.

28805287 is a deficient number, since it is larger than the sum of its proper divisors (4702961).

28805287 is an equidigital number, since it uses as much as digits as its factorization.

28805287 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 587877 (or 587870 counting only the distinct ones).

The product of its (nonzero) digits is 71680, while the sum is 40.

The square root of 28805287 is about 5367.0557105363. The cubic root of 28805287 is about 306.5425286522.

It can be divided in two parts, 28805 and 287, that added together give a palindrome (29092).

The spelling of 28805287 in words is "twenty-eight million, eight hundred five thousand, two hundred eighty-seven".