28258387 has 2 divisors, whose sum is σ = 28258388. Its totient is φ = 28258386.

The previous prime is 28258367. The next prime is 28258409. The reversal of 28258387 is 78385282.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 28258387 - 2¹⁵ = 28225619 is a prime.

It is not a weakly prime, because it can be changed into another prime (28258357) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 14129193 + 14129194.

It is an arithmetic number, because the mean of its divisors is an integer number (14129194).

Almost surely, 2^28258387 is an apocalyptic number.

28258387 is a deficient number, since it is larger than the sum of its proper divisors (1).

28258387 is an equidigital number, since it uses as much as digits as its factorization.

28258387 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 215040, while the sum is 43.

The square root of 28258387 is about 5315.8618304091. The cubic root of 28258387 is about 304.5901042213.

The spelling of 28258387 in words is "twenty-eight million, two hundred fifty-eight thousand, three hundred eighty-seven".