28894513 has 2 divisors, whose sum is σ = 28894514. Its totient is φ = 28894512.

The previous prime is 28894501. The next prime is 28894529. The reversal of 28894513 is 31549882.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 28005264 + 889249 = 5292^2 + 943^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-28894513 is a prime.

It is not a weakly prime, because it can be changed into another prime (28834513) 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, 14447256 + 14447257.

It is an arithmetic number, because the mean of its divisors is an integer number (14447257).

Almost surely, 2^28894513 is an apocalyptic number.

It is an amenable number.

28894513 is a deficient number, since it is larger than the sum of its proper divisors (1).

28894513 is an equidigital number, since it uses as much as digits as its factorization.

28894513 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 69120, while the sum is 40.

The square root of 28894513 is about 5375.3616622512. The cubic root of 28894513 is about 306.8587133299.

The spelling of 28894513 in words is "twenty-eight million, eight hundred ninety-four thousand, five hundred thirteen".