28216867 has 4 divisors (see below), whose sum is σ = 32247856. Its totient is φ = 24185880.

The previous prime is 28216847. The next prime is 28216879. The reversal of 28216867 is 76861282.

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 28216867 - 2¹⁵ = 28184099 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (28216817) 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 3 ways as a sum of consecutive naturals, for example, 2015484 + ... + 2015497.

It is an arithmetic number, because the mean of its divisors is an integer number (8061964).

Almost surely, 2^28216867 is an apocalyptic number.

28216867 is a deficient number, since it is larger than the sum of its proper divisors (4030989).

28216867 is an equidigital number, since it uses as much as digits as its factorization.

28216867 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4030988.

The product of its digits is 64512, while the sum is 40.

The square root of 28216867 is about 5311.9551014669. The cubic root of 28216867 is about 304.4408531918.

The spelling of 28216867 in words is "twenty-eight million, two hundred sixteen thousand, eight hundred sixty-seven".