28922218 has 32 divisors (see below), whose sum is σ = 49674240. Its totient is φ = 12519360.

The previous prime is 28922209. The next prime is 28922233. The reversal of 28922218 is 81222982.

It is a happy number.

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 15 ways as a sum of consecutive naturals, for example, 62508 + ... + 62968.

It is an arithmetic number, because the mean of its divisors is an integer number (1552320).

Almost surely, 2^28922218 is an apocalyptic number.

28922218 is a deficient number, since it is larger than the sum of its proper divisors (20752022).

28922218 is a wasteful number, since it uses less digits than its factorization.

28922218 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 622.

The product of its digits is 9216, while the sum is 34.

The square root of 28922218 is about 5377.9380807146. The cubic root of 28922218 is about 306.9567573763.

The spelling of 28922218 in words is "twenty-eight million, nine hundred twenty-two thousand, two hundred eighteen".