28539551 has 2 divisors, whose sum is σ = 28539552. Its totient is φ = 28539550.

The previous prime is 28539547. The next prime is 28539557. The reversal of 28539551 is 15593582.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 28539551 - 2² = 28539547 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (28539557) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 14269775 + 14269776.

It is an arithmetic number, because the mean of its divisors is an integer number (14269776).

Almost surely, 2^28539551 is an apocalyptic number.

28539551 is a deficient number, since it is larger than the sum of its proper divisors (1).

28539551 is an equidigital number, since it uses as much as digits as its factorization.

28539551 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 54000, while the sum is 38.

The square root of 28539551 is about 5342.2421322887. The cubic root of 28539551 is about 305.5969710817.

The spelling of 28539551 in words is "twenty-eight million, five hundred thirty-nine thousand, five hundred fifty-one".