28388513 has 2 divisors, whose sum is σ = 28388514. Its totient is φ = 28388512.

The previous prime is 28388473. The next prime is 28388533. The reversal of 28388513 is 31588382.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 19430464 + 8958049 = 4408^2 + 2993^2 .

It is a cyclic number.

It is not a de Polignac number, because 28388513 - 2⁶ = 28388449 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (28388533) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 14194256 + 14194257.

It is an arithmetic number, because the mean of its divisors is an integer number (14194257).

Almost surely, 2^28388513 is an apocalyptic number.

It is an amenable number.

28388513 is a deficient number, since it is larger than the sum of its proper divisors (1).

28388513 is an equidigital number, since it uses as much as digits as its factorization.

28388513 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 46080, while the sum is 38.

The square root of 28388513 is about 5328.0871802177. The cubic root of 28388513 is about 305.0569203092.

The spelling of 28388513 in words is "twenty-eight million, three hundred eighty-eight thousand, five hundred thirteen".