28910293 has 2 divisors, whose sum is σ = 28910294. Its totient is φ = 28910292.

The previous prime is 28910291. The next prime is 28910317. The reversal of 28910293 is 39201982.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 17363889 + 11546404 = 4167^2 + 3398^2 .

It is a cyclic number.

It is not a de Polignac number, because 28910293 - 2¹ = 28910291 is a prime.

Together with 28910291, it forms a pair of twin primes.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (28910291) 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, 14455146 + 14455147.

It is an arithmetic number, because the mean of its divisors is an integer number (14455147).

Almost surely, 2^28910293 is an apocalyptic number.

It is an amenable number.

28910293 is a deficient number, since it is larger than the sum of its proper divisors (1).

28910293 is an equidigital number, since it uses as much as digits as its factorization.

28910293 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 7776, while the sum is 34.

The square root of 28910293 is about 5376.8292701182. The cubic root of 28910293 is about 306.9145641792.

The spelling of 28910293 in words is "twenty-eight million, nine hundred ten thousand, two hundred ninety-three".