28631717 has 2 divisors, whose sum is σ = 28631718. Its totient is φ = 28631716.

The previous prime is 28631663. The next prime is 28631719. The reversal of 28631717 is 71713682.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 27867841 + 763876 = 5279^2 + 874^2 .

It is a cyclic number.

It is not a de Polignac number, because 28631717 - 2¹⁴ = 28615333 is a prime.

Together with 28631719, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (28631719) 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, 14315858 + 14315859.

It is an arithmetic number, because the mean of its divisors is an integer number (14315859).

Almost surely, 2^28631717 is an apocalyptic number.

It is an amenable number.

28631717 is a deficient number, since it is larger than the sum of its proper divisors (1).

28631717 is an equidigital number, since it uses as much as digits as its factorization.

28631717 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 14112, while the sum is 35.

The square root of 28631717 is about 5350.8613325333. The cubic root of 28631717 is about 305.9255838807.

The spelling of 28631717 in words is "twenty-eight million, six hundred thirty-one thousand, seven hundred seventeen".