28243679 has 2 divisors, whose sum is σ = 28243680. Its totient is φ = 28243678.

The previous prime is 28243673. The next prime is 28243687. The reversal of 28243679 is 97634282.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 28243679 - 2²⁴ = 11466463 is a prime.

It is a Sophie Germain prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (28243673) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 14121839 + 14121840.

It is an arithmetic number, because the mean of its divisors is an integer number (14121840).

Almost surely, 2^28243679 is an apocalyptic number.

28243679 is a deficient number, since it is larger than the sum of its proper divisors (1).

28243679 is an equidigital number, since it uses as much as digits as its factorization.

28243679 is an odious number, because the sum of its binary digits is odd.

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

The square root of 28243679 is about 5314.4782434403. The cubic root of 28243679 is about 304.5372504294.

The spelling of 28243679 in words is "twenty-eight million, two hundred forty-three thousand, six hundred seventy-nine".