28239437 has 2 divisors, whose sum is σ = 28239438. Its totient is φ = 28239436.

The previous prime is 28239427. The next prime is 28239443. The reversal of 28239437 is 73493282.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 28238596 + 841 = 5314^2 + 29^2 .

It is a cyclic number.

It is not a de Polignac number, because 28239437 - 2⁶ = 28239373 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 28239437.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (28239427) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 14119718 + 14119719.

It is an arithmetic number, because the mean of its divisors is an integer number (14119719).

Almost surely, 2^28239437 is an apocalyptic number.

It is an amenable number.

28239437 is a deficient number, since it is larger than the sum of its proper divisors (1).

28239437 is an equidigital number, since it uses as much as digits as its factorization.

28239437 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 72576, while the sum is 38.

The square root of 28239437 is about 5314.0791300093. The cubic root of 28239437 is about 304.5220032220.

The spelling of 28239437 in words is "twenty-eight million, two hundred thirty-nine thousand, four hundred thirty-seven".