28192218 has 16 divisors (see below), whose sum is σ = 56436480. Its totient is φ = 9388736.

The previous prime is 28192217. The next prime is 28192249. The reversal of 28192218 is 81229182.

It is not an unprimeable number, because it can be changed into a prime (28192211) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 11671 + ... + 13877.

It is an arithmetic number, because the mean of its divisors is an integer number (3527280).

Almost surely, 2^28192218 is an apocalyptic number.

28192218 is an abundant number, since it is smaller than the sum of its proper divisors (28244262).

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

28192218 is a wasteful number, since it uses less digits than its factorization.

28192218 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4341.

The product of its digits is 4608, while the sum is 33.

The square root of 28192218 is about 5309.6344506943. The cubic root of 28192218 is about 304.3521787032.

The spelling of 28192218 in words is "twenty-eight million, one hundred ninety-two thousand, two hundred eighteen".