28268644 has 6 divisors (see below), whose sum is σ = 49470134. Its totient is φ = 14134320.

The previous prime is 28268623. The next prime is 28268677. The reversal of 28268644 is 44686282.

It can be written as a sum of positive squares in only one way, i.e., 19027044 + 9241600 = 4362^2 + 3040^2 .

It is a junction number, because it is equal to n+sod(n) for n = 28268597 and 28268606.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3533577 + ... + 3533584.

Almost surely, 2^28268644 is an apocalyptic number.

It is an amenable number.

28268644 is a deficient number, since it is larger than the sum of its proper divisors (21201490).

28268644 is a wasteful number, since it uses less digits than its factorization.

28268644 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7067165 (or 7067163 counting only the distinct ones).

The product of its digits is 147456, while the sum is 40.

The square root of 28268644 is about 5316.8264970751. The cubic root of 28268644 is about 304.6269523115.

The spelling of 28268644 in words is "twenty-eight million, two hundred sixty-eight thousand, six hundred forty-four".