28444218 has 32 divisors (see below), whose sum is σ = 62249472. Its totient is φ = 8593200.

The previous prime is 28444217. The next prime is 28444219. The reversal of 28444218 is 81244482.

It is an interprime number because it is at equal distance from previous prime (28444217) and next prime (28444219).

It is a Harshad number since it is a multiple of its sum of digits (33).

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (28444217) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 41305 + ... + 41987.

It is an arithmetic number, because the mean of its divisors is an integer number (1945296).

Almost surely, 2^28444218 is an apocalyptic number.

28444218 is an abundant number, since it is smaller than the sum of its proper divisors (33805254).

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

28444218 is a wasteful number, since it uses less digits than its factorization.

28444218 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1330.

The product of its digits is 16384, while the sum is 33.

The square root of 28444218 is about 5333.3121041244. The cubic root of 28444218 is about 305.2563213011.

The spelling of 28444218 in words is "twenty-eight million, four hundred forty-four thousand, two hundred eighteen".