28687013 has 2 divisors, whose sum is σ = 28687014. Its totient is φ = 28687012.

The previous prime is 28686991. The next prime is 28687031. The reversal of 28687013 is 31078682.

Together with next prime (28687031) it forms an Ormiston pair, because they use the same digits, order apart.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 25421764 + 3265249 = 5042^2 + 1807^2 .

It is a cyclic number.

It is not a de Polignac number, because 28687013 - 2¹² = 28682917 is a prime.

It is a Sophie Germain prime.

It is a Curzon number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (28687213) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 14343506 + 14343507.

It is an arithmetic number, because the mean of its divisors is an integer number (14343507).

Almost surely, 2^28687013 is an apocalyptic number.

It is an amenable number.

28687013 is a deficient number, since it is larger than the sum of its proper divisors (1).

28687013 is an equidigital number, since it uses as much as digits as its factorization.

28687013 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 16128, while the sum is 35.

The square root of 28687013 is about 5356.0258587875. The cubic root of 28687013 is about 306.1224003760.

The spelling of 28687013 in words is "twenty-eight million, six hundred eighty-seven thousand, thirteen".