28336538 has 16 divisors (see below), whose sum is σ = 44097480. Its totient is φ = 13640256.

The previous prime is 28336537. The next prime is 28336541. The reversal of 28336538 is 83563382.

It can be written as a sum of positive squares in 4 ways, for example, as 15108769 + 13227769 = 3887^2 + 3637^2 .

It is not an unprimeable number, because it can be changed into a prime (28336531) 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, 35156 + ... + 35952.

Almost surely, 2^28336538 is an apocalyptic number.

28336538 is a deficient number, since it is larger than the sum of its proper divisors (15760942).

28336538 is a wasteful number, since it uses less digits than its factorization.

28336538 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1441.

The product of its digits is 103680, while the sum is 38.

The square root of 28336538 is about 5323.2074917290. The cubic root of 28336538 is about 304.8706358132.

The spelling of 28336538 in words is "twenty-eight million, three hundred thirty-six thousand, five hundred thirty-eight".