28399218 has 8 divisors (see below), whose sum is σ = 56798448. Its totient is φ = 9466404.

The previous prime is 28399213. The next prime is 28399249. The reversal of 28399218 is 81299382.

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

28399218 is an admirable number.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 28399218.

It is not an unprimeable number, because it can be changed into a prime (28399213) 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, 2366596 + ... + 2366607.

It is an arithmetic number, because the mean of its divisors is an integer number (7099806).

Almost surely, 2^28399218 is an apocalyptic number.

28399218 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

28399218 is a wasteful number, since it uses less digits than its factorization.

28399218 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4733208.

The product of its digits is 62208, while the sum is 42.

The square root of 28399218 is about 5329.0916674420. The cubic root of 28399218 is about 305.0952600412.

The spelling of 28399218 in words is "twenty-eight million, three hundred ninety-nine thousand, two hundred eighteen".