28276439 has 2 divisors, whose sum is σ = 28276440. Its totient is φ = 28276438.

The previous prime is 28276397. The next prime is 28276459. The reversal of 28276439 is 93467282.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-28276439 is a prime.

It is a Sophie Germain prime.

It is a Chen prime.

It is a junction number, because it is equal to n+sod(n) for n = 28276396 and 28276405.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (28276459) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 14138219 + 14138220.

It is an arithmetic number, because the mean of its divisors is an integer number (14138220).

Almost surely, 2^28276439 is an apocalyptic number.

28276439 is a deficient number, since it is larger than the sum of its proper divisors (1).

28276439 is an equidigital number, since it uses as much as digits as its factorization.

28276439 is an evil number, because the sum of its binary digits is even.

The product of its digits is 145152, while the sum is 41.

The square root of 28276439 is about 5317.5594966112. The cubic root of 28276439 is about 304.6549497500.

The spelling of 28276439 in words is "twenty-eight million, two hundred seventy-six thousand, four hundred thirty-nine".