28679639 has 2 divisors, whose sum is σ = 28679640. Its totient is φ = 28679638.

The previous prime is 28679621. The next prime is 28679641. The reversal of 28679639 is 93697682.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 28679639 - 2⁸ = 28679383 is a prime.

It is a Sophie Germain prime.

Together with 28679641, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (28679039) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 14339819 + 14339820.

It is an arithmetic number, because the mean of its divisors is an integer number (14339820).

Almost surely, 2^28679639 is an apocalyptic number.

28679639 is a deficient number, since it is larger than the sum of its proper divisors (1).

28679639 is an equidigital number, since it uses as much as digits as its factorization.

28679639 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 979776, while the sum is 50.

The square root of 28679639 is about 5355.3374310122. The cubic root of 28679639 is about 306.0961685288.

The spelling of 28679639 in words is "twenty-eight million, six hundred seventy-nine thousand, six hundred thirty-nine".