28216858 has 8 divisors (see below), whose sum is σ = 43309728. Its totient is φ = 13780284.

The previous prime is 28216847. The next prime is 28216879. The reversal of 28216858 is 85861282.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a self number, because there is not a number n which added to its sum of digits gives 28216858.

It is an unprimeable number.

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, 163966 + ... + 164137.

It is an arithmetic number, because the mean of its divisors is an integer number (5413716).

Almost surely, 2^28216858 is an apocalyptic number.

28216858 is a deficient number, since it is larger than the sum of its proper divisors (15092870).

28216858 is a wasteful number, since it uses less digits than its factorization.

28216858 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 328148.

The product of its digits is 61440, while the sum is 40.

The square root of 28216858 is about 5311.9542543211. The cubic root of 28216858 is about 304.4408208238.

The spelling of 28216858 in words is "twenty-eight million, two hundred sixteen thousand, eight hundred fifty-eight".