28236644 has 6 divisors (see below), whose sum is σ = 49414134. Its totient is φ = 14118320.

The previous prime is 28236631. The next prime is 28236647. The reversal of 28236644 is 44663282.

It can be written as a sum of positive squares in only one way, i.e., 22657600 + 5579044 = 4760^2 + 2362^2 .

It is not an unprimeable number, because it can be changed into a prime (28236647) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3529577 + ... + 3529584.

It is an arithmetic number, because the mean of its divisors is an integer number (8235689).

Almost surely, 2^28236644 is an apocalyptic number.

It is an amenable number.

28236644 is a deficient number, since it is larger than the sum of its proper divisors (21177490).

28236644 is a wasteful number, since it uses less digits than its factorization.

28236644 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7059165 (or 7059163 counting only the distinct ones).

The product of its digits is 55296, while the sum is 35.

The square root of 28236644 is about 5313.8163310374. The cubic root of 28236644 is about 304.5119633854.

The spelling of 28236644 in words is "twenty-eight million, two hundred thirty-six thousand, six hundred forty-four".