28542391 has 2 divisors, whose sum is σ = 28542392. Its totient is φ = 28542390.

The previous prime is 28542377. The next prime is 28542401. The reversal of 28542391 is 19324582.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 28542391 - 2⁵ = 28542359 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (28542341) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 14271195 + 14271196.

It is an arithmetic number, because the mean of its divisors is an integer number (14271196).

Almost surely, 2^28542391 is an apocalyptic number.

28542391 is a deficient number, since it is larger than the sum of its proper divisors (1).

28542391 is an equidigital number, since it uses as much as digits as its factorization.

28542391 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 17280, while the sum is 34.

The square root of 28542391 is about 5342.5079316740. The cubic root of 28542391 is about 305.6071075015.

The spelling of 28542391 in words is "twenty-eight million, five hundred forty-two thousand, three hundred ninety-one".