28642879 has 2 divisors, whose sum is σ = 28642880. Its totient is φ = 28642878.

The previous prime is 28642877. The next prime is 28642883. The reversal of 28642879 is 97824682.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 28642879 - 2¹ = 28642877 is a prime.

Together with 28642877, it forms a pair of twin primes.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (28642871) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 14321439 + 14321440.

It is an arithmetic number, because the mean of its divisors is an integer number (14321440).

Almost surely, 2^28642879 is an apocalyptic number.

28642879 is a deficient number, since it is larger than the sum of its proper divisors (1).

28642879 is an equidigital number, since it uses as much as digits as its factorization.

28642879 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 387072, while the sum is 46.

The square root of 28642879 is about 5351.9042405484. The cubic root of 28642879 is about 305.9653334786.

The spelling of 28642879 in words is "twenty-eight million, six hundred forty-two thousand, eight hundred seventy-nine".