28647893 has 2 divisors, whose sum is σ = 28647894. Its totient is φ = 28647892.

The previous prime is 28647869. The next prime is 28647919. The reversal of 28647893 is 39874682.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 20133169 + 8514724 = 4487^2 + 2918^2 .

It is a cyclic number.

It is not a de Polignac number, because 28647893 - 2⁸ = 28647637 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (28647803) 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, 14323946 + 14323947.

It is an arithmetic number, because the mean of its divisors is an integer number (14323947).

Almost surely, 2^28647893 is an apocalyptic number.

It is an amenable number.

28647893 is a deficient number, since it is larger than the sum of its proper divisors (1).

28647893 is an equidigital number, since it uses as much as digits as its factorization.

28647893 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 580608, while the sum is 47.

The square root of 28647893 is about 5352.3726514509. The cubic root of 28647893 is about 305.9831857422.

The spelling of 28647893 in words is "twenty-eight million, six hundred forty-seven thousand, eight hundred ninety-three".