28897313 has 2 divisors, whose sum is σ = 28897314. Its totient is φ = 28897312.

The previous prime is 28897307. The next prime is 28897343. The reversal of 28897313 is 31379882.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 26956864 + 1940449 = 5192^2 + 1393^2 .

It is a cyclic number.

It is not a de Polignac number, because 28897313 - 2⁶ = 28897249 is a prime.

It is not a weakly prime, because it can be changed into another prime (28897303) 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, 14448656 + 14448657.

It is an arithmetic number, because the mean of its divisors is an integer number (14448657).

Almost surely, 2^28897313 is an apocalyptic number.

It is an amenable number.

28897313 is a deficient number, since it is larger than the sum of its proper divisors (1).

28897313 is an equidigital number, since it uses as much as digits as its factorization.

28897313 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 72576, while the sum is 41.

The square root of 28897313 is about 5375.6221035337. The cubic root of 28897313 is about 306.8686249770.

The spelling of 28897313 in words is "twenty-eight million, eight hundred ninety-seven thousand, three hundred thirteen".