28365619 has 2 divisors, whose sum is σ = 28365620. Its totient is φ = 28365618.

The previous prime is 28365611. The next prime is 28365641. The reversal of 28365619 is 91656382.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 28365619 - 2³ = 28365611 is a prime.

It is a super-2 number, since 2×28365619² = 1609216682506322, which contains 22 as substring.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (28365611) 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, 14182809 + 14182810.

It is an arithmetic number, because the mean of its divisors is an integer number (14182810).

Almost surely, 2^28365619 is an apocalyptic number.

28365619 is a deficient number, since it is larger than the sum of its proper divisors (1).

28365619 is an equidigital number, since it uses as much as digits as its factorization.

28365619 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 77760, while the sum is 40.

The square root of 28365619 is about 5325.9383210848. The cubic root of 28365619 is about 304.9748935708.

The spelling of 28365619 in words is "twenty-eight million, three hundred sixty-five thousand, six hundred nineteen".