28018244 has 12 divisors (see below), whose sum is σ = 51916284. Its totient is φ = 13185024.

The previous prime is 28018187. The next prime is 28018247. The reversal of 28018244 is 44281082.

It can be written as a sum of positive squares in 2 ways, for example, as 9424900 + 18593344 = 3070^2 + 4312^2 .

It is not an unprimeable number, because it can be changed into a prime (28018247) 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 3 ways as a sum of consecutive naturals, for example, 205949 + ... + 206084.

It is an arithmetic number, because the mean of its divisors is an integer number (4326357).

Almost surely, 2^28018244 is an apocalyptic number.

It is an amenable number.

28018244 is a deficient number, since it is larger than the sum of its proper divisors (23898040).

28018244 is a wasteful number, since it uses less digits than its factorization.

28018244 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 412054 (or 412052 counting only the distinct ones).

The product of its (nonzero) digits is 4096, while the sum is 29.

The square root of 28018244 is about 5293.2262373717. The cubic root of 28018244 is about 303.7248346891.

The spelling of 28018244 in words is "twenty-eight million, eighteen thousand, two hundred forty-four".