28444220 has 24 divisors (see below), whose sum is σ = 68266464. Its totient is φ = 9752256.

The previous prime is 28444219. The next prime is 28444223. The reversal of 28444220 is 2244482.

It is a self number, because there is not a number n which added to its sum of digits gives 28444220.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28444223) 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 7 ways as a sum of consecutive naturals, for example, 101447 + ... + 101726.

It is an arithmetic number, because the mean of its divisors is an integer number (2844436).

Almost surely, 2^28444220 is an apocalyptic number.

28444220 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

28444220 is an abundant number, since it is smaller than the sum of its proper divisors (39822244).

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

28444220 is a wasteful number, since it uses less digits than its factorization.

28444220 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 203189 (or 203187 counting only the distinct ones).

The product of its (nonzero) digits is 4096, while the sum is 26.

The square root of 28444220 is about 5333.3122916252. The cubic root of 28444220 is about 305.2563284556.

The spelling of 28444220 in words is "twenty-eight million, four hundred forty-four thousand, two hundred twenty".