28938313 has 2 divisors, whose sum is σ = 28938314. Its totient is φ = 28938312.

The previous prime is 28938307. The next prime is 28938383. The reversal of 28938313 is 31383982.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 18421264 + 10517049 = 4292^2 + 3243^2 .

It is a cyclic number.

It is not a de Polignac number, because 28938313 - 2⁹ = 28937801 is a prime.

It is not a weakly prime, because it can be changed into another prime (28938383) 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, 14469156 + 14469157.

It is an arithmetic number, because the mean of its divisors is an integer number (14469157).

Almost surely, 2^28938313 is an apocalyptic number.

It is an amenable number.

28938313 is a deficient number, since it is larger than the sum of its proper divisors (1).

28938313 is an equidigital number, since it uses as much as digits as its factorization.

28938313 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 31104, while the sum is 37.

The square root of 28938313 is about 5379.4342639352. The cubic root of 28938313 is about 307.0136865377.

The spelling of 28938313 in words is "twenty-eight million, nine hundred thirty-eight thousand, three hundred thirteen".