28578269 has 2 divisors, whose sum is σ = 28578270. Its totient is φ = 28578268.

The previous prime is 28578257. The next prime is 28578283. The reversal of 28578269 is 96287582.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 17322244 + 11256025 = 4162^2 + 3355^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-28578269 is a prime.

It is a super-2 number, since 2×28578269² = 1633434918072722, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (28578469) 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, 14289134 + 14289135.

It is an arithmetic number, because the mean of its divisors is an integer number (14289135).

Almost surely, 2^28578269 is an apocalyptic number.

It is an amenable number.

28578269 is a deficient number, since it is larger than the sum of its proper divisors (1).

28578269 is an equidigital number, since it uses as much as digits as its factorization.

28578269 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 483840, while the sum is 47.

The square root of 28578269 is about 5345.8646634572. The cubic root of 28578269 is about 305.7351040292.

The spelling of 28578269 in words is "twenty-eight million, five hundred seventy-eight thousand, two hundred sixty-nine".