28258493 has 2 divisors, whose sum is σ = 28258494. Its totient is φ = 28258492.

The previous prime is 28258469. The next prime is 28258507. The reversal of 28258493 is 39485282.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 17322244 + 10936249 = 4162^2 + 3307^2 .

It is a cyclic number.

It is not a de Polignac number, because 28258493 - 2¹⁰ = 28257469 is a prime.

It is a Sophie Germain prime.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 28258493.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (28258423) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 14129246 + 14129247.

It is an arithmetic number, because the mean of its divisors is an integer number (14129247).

Almost surely, 2^28258493 is an apocalyptic number.

It is an amenable number.

28258493 is a deficient number, since it is larger than the sum of its proper divisors (1).

28258493 is an equidigital number, since it uses as much as digits as its factorization.

28258493 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 138240, while the sum is 41.

The square root of 28258493 is about 5315.8718005610. The cubic root of 28258493 is about 304.5904850700.

The spelling of 28258493 in words is "twenty-eight million, two hundred fifty-eight thousand, four hundred ninety-three".