28384387 has 2 divisors, whose sum is σ = 28384388. Its totient is φ = 28384386.

The previous prime is 28384379. The next prime is 28384393. The reversal of 28384387 is 78348382.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 28384387 - 2³ = 28384379 is a prime.

It is not a weakly prime, because it can be changed into another prime (28384397) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 14192193 + 14192194.

It is an arithmetic number, because the mean of its divisors is an integer number (14192194).

Almost surely, 2^28384387 is an apocalyptic number.

28384387 is a deficient number, since it is larger than the sum of its proper divisors (1).

28384387 is an equidigital number, since it uses as much as digits as its factorization.

28384387 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 258048, while the sum is 43.

The square root of 28384387 is about 5327.6999727838. The cubic root of 28384387 is about 305.0421405538.

It can be divided in two parts, 2838 and 4387, that added together give a square (7225 = 85²).

The spelling of 28384387 in words is "twenty-eight million, three hundred eighty-four thousand, three hundred eighty-seven".