28816287 has 4 divisors (see below), whose sum is σ = 38421720. Its totient is φ = 19210856.

The previous prime is 28816253. The next prime is 28816289. The reversal of 28816287 is 78261882.

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 28816287 - 2⁶ = 28816223 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28816289) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 4802712 + ... + 4802717.

It is an arithmetic number, because the mean of its divisors is an integer number (9605430).

Almost surely, 2^28816287 is an apocalyptic number.

28816287 is a deficient number, since it is larger than the sum of its proper divisors (9605433).

28816287 is an equidigital number, since it uses as much as digits as its factorization.

28816287 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9605432.

The product of its digits is 86016, while the sum is 42.

The square root of 28816287 is about 5368.0803831537. The cubic root of 28816287 is about 306.5815439284.

The spelling of 28816287 in words is "twenty-eight million, eight hundred sixteen thousand, two hundred eighty-seven".