28465813 has 2 divisors, whose sum is σ = 28465814. Its totient is φ = 28465812.

The previous prime is 28465807. The next prime is 28465841. The reversal of 28465813 is 31856482.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 28323684 + 142129 = 5322^2 + 377^2 .

It is a cyclic number.

It is not a de Polignac number, because 28465813 - 2⁹ = 28465301 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (28465313) 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, 14232906 + 14232907.

It is an arithmetic number, because the mean of its divisors is an integer number (14232907).

Almost surely, 2^28465813 is an apocalyptic number.

It is an amenable number.

28465813 is a deficient number, since it is larger than the sum of its proper divisors (1).

28465813 is an equidigital number, since it uses as much as digits as its factorization.

28465813 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 46080, while the sum is 37.

The square root of 28465813 is about 5335.3362593186. The cubic root of 28465813 is about 305.3335524948. Note that the first 3 decimals are identical.

The spelling of 28465813 in words is "twenty-eight million, four hundred sixty-five thousand, eight hundred thirteen".