28243879 has 2 divisors, whose sum is σ = 28243880. Its totient is φ = 28243878.

The previous prime is 28243877. The next prime is 28243903. The reversal of 28243879 is 97834282.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 28243879 - 2¹ = 28243877 is a prime.

Together with 28243877, 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 (28243877) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 14121939 + 14121940.

It is an arithmetic number, because the mean of its divisors is an integer number (14121940).

Almost surely, 2^28243879 is an apocalyptic number.

28243879 is a deficient number, since it is larger than the sum of its proper divisors (1).

28243879 is an equidigital number, since it uses as much as digits as its factorization.

28243879 is an evil number, because the sum of its binary digits is even.

The product of its digits is 193536, while the sum is 43.

The square root of 28243879 is about 5314.4970599296. The cubic root of 28243879 is about 304.5379692605.

The spelling of 28243879 in words is "twenty-eight million, two hundred forty-three thousand, eight hundred seventy-nine".