28187039 has 2 divisors, whose sum is σ = 28187040. Its totient is φ = 28187038.

The previous prime is 28187021. The next prime is 28187041. The reversal of 28187039 is 93078182.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 28187039 - 2⁸ = 28186783 is a prime.

Together with 28187041, it forms a pair of twin primes.

It is a Chen prime.

It is a junction number, because it is equal to n+sod(n) for n = 28186993 and 28187011.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (28187009) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 14093519 + 14093520.

It is an arithmetic number, because the mean of its divisors is an integer number (14093520).

Almost surely, 2^28187039 is an apocalyptic number.

28187039 is a deficient number, since it is larger than the sum of its proper divisors (1).

28187039 is an equidigital number, since it uses as much as digits as its factorization.

28187039 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 24192, while the sum is 38.

The square root of 28187039 is about 5309.1467299369. The cubic root of 28187039 is about 304.3335407412. Note that the first 3 decimals are identical.

The spelling of 28187039 in words is "twenty-eight million, one hundred eighty-seven thousand, thirty-nine".