28664218 has 8 divisors (see below), whose sum is σ = 46905120. Its totient is φ = 13029180.

The previous prime is 28664213. The next prime is 28664231. The reversal of 28664218 is 81246682.

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

It is not an unprimeable number, because it can be changed into a prime (28664213) 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, 651438 + ... + 651481.

It is an arithmetic number, because the mean of its divisors is an integer number (5863140).

Almost surely, 2^28664218 is an apocalyptic number.

28664218 is a deficient number, since it is larger than the sum of its proper divisors (18240902).

28664218 is a wasteful number, since it uses less digits than its factorization.

28664218 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1302932.

The product of its digits is 36864, while the sum is 37.

The square root of 28664218 is about 5353.8974588612. The cubic root of 28664218 is about 306.0412962051.

It can be divided in two parts, 28664 and 218, that added together give a palindrome (28882).

The spelling of 28664218 in words is "twenty-eight million, six hundred sixty-four thousand, two hundred eighteen".