28668751 has 2 divisors, whose sum is σ = 28668752. Its totient is φ = 28668750.

The previous prime is 28668743. The next prime is 28668763. The reversal of 28668751 is 15786682.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 28668751 - 2³ = 28668743 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 28668698 and 28668707.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (28668721) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 14334375 + 14334376.

It is an arithmetic number, because the mean of its divisors is an integer number (14334376).

Almost surely, 2^28668751 is an apocalyptic number.

28668751 is a deficient number, since it is larger than the sum of its proper divisors (1).

28668751 is an equidigital number, since it uses as much as digits as its factorization.

28668751 is an evil number, because the sum of its binary digits is even.

The product of its digits is 161280, while the sum is 43.

The square root of 28668751 is about 5354.3207785862. The cubic root of 28668751 is about 306.0574279560.

The spelling of 28668751 in words is "twenty-eight million, six hundred sixty-eight thousand, seven hundred fifty-one".