28639528 has 16 divisors (see below), whose sum is σ = 53798580. Its totient is φ = 14293248.

The previous prime is 28639493. The next prime is 28639529. The reversal of 28639528 is 82593682.

It can be written as a sum of positive squares in 2 ways, for example, as 28323684 + 315844 = 5322^2 + 562^2 .

It is a plaindrome in base 15.

It is not an unprimeable number, because it can be changed into a prime (28639529) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1726 + ... + 7762.

Almost surely, 2^28639528 is an apocalyptic number.

It is an amenable number.

28639528 is a deficient number, since it is larger than the sum of its proper divisors (25159052).

28639528 is a wasteful number, since it uses less digits than its factorization.

28639528 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6636 (or 6632 counting only the distinct ones).

The product of its digits is 207360, while the sum is 43.

The square root of 28639528 is about 5351.5911652517. The cubic root of 28639528 is about 305.9534011374.

The spelling of 28639528 in words is "twenty-eight million, six hundred thirty-nine thousand, five hundred twenty-eight".