28817087 has 4 divisors (see below), whose sum is σ = 31033800. Its totient is φ = 26600376.

The previous prime is 28817081. The next prime is 28817099. The reversal of 28817087 is 78071882.

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 28817087 - 2¹⁶ = 28751551 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 (28817081) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1108337 + ... + 1108362.

It is an arithmetic number, because the mean of its divisors is an integer number (7758450).

Almost surely, 2^28817087 is an apocalyptic number.

28817087 is a deficient number, since it is larger than the sum of its proper divisors (2216713).

28817087 is a wasteful number, since it uses less digits than its factorization.

28817087 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2216712.

The product of its (nonzero) digits is 50176, while the sum is 41.

The square root of 28817087 is about 5368.1548971690. The cubic root of 28817087 is about 306.5843810157.

The spelling of 28817087 in words is "twenty-eight million, eight hundred seventeen thousand, eighty-seven".