28644226 has 16 divisors (see below), whose sum is σ = 46368504. Its totient is φ = 13192704.

The previous prime is 28644193. The next prime is 28644227. The reversal of 28644226 is 62244682.

It can be written as a sum of positive squares in 4 ways, for example, as 8850625 + 19793601 = 2975^2 + 4449^2 .

It is a junction number, because it is equal to n+sod(n) for n = 28644191 and 28644200.

It is not an unprimeable number, because it can be changed into a prime (28644227) 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, 16680 + ... + 18316.

Almost surely, 2^28644226 is an apocalyptic number.

28644226 is a gapful number since it is divisible by the number (26) formed by its first and last digit.

28644226 is a deficient number, since it is larger than the sum of its proper divisors (17724278).

28644226 is a wasteful number, since it uses less digits than its factorization.

28644226 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2325.

The product of its digits is 36864, while the sum is 34.

The square root of 28644226 is about 5352.0300821277. The cubic root of 28644226 is about 305.9701296544.

The spelling of 28644226 in words is "twenty-eight million, six hundred forty-four thousand, two hundred twenty-six".