28238537 has 2 divisors, whose sum is σ = 28238538. Its totient is φ = 28238536.

The previous prime is 28238527. The next prime is 28238563. The reversal of 28238537 is 73583282.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 14280841 + 13957696 = 3779^2 + 3736^2 .

It is a cyclic number.

It is not a de Polignac number, because 28238537 - 2⁸ = 28238281 is a prime.

It is a Chen prime.

It is a self number, because there is not a number n which added to its sum of digits gives 28238537.

It is not a weakly prime, because it can be changed into another prime (28238527) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 14119268 + 14119269.

It is an arithmetic number, because the mean of its divisors is an integer number (14119269).

Almost surely, 2^28238537 is an apocalyptic number.

It is an amenable number.

28238537 is a deficient number, since it is larger than the sum of its proper divisors (1).

28238537 is an equidigital number, since it uses as much as digits as its factorization.

28238537 is an evil number, because the sum of its binary digits is even.

The product of its digits is 80640, while the sum is 38.

The square root of 28238537 is about 5313.9944486234. The cubic root of 28238537 is about 304.5187681160.

The spelling of 28238537 in words is "twenty-eight million, two hundred thirty-eight thousand, five hundred thirty-seven".