28276861 has 2 divisors, whose sum is σ = 28276862. Its totient is φ = 28276860.

The previous prime is 28276847. The next prime is 28276873. The reversal of 28276861 is 16867282.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 17347225 + 10929636 = 4165^2 + 3306^2 .

It is a cyclic number.

It is not a de Polignac number, because 28276861 - 2⁹ = 28276349 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (28276841) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 14138430 + 14138431.

It is an arithmetic number, because the mean of its divisors is an integer number (14138431).

Almost surely, 2^28276861 is an apocalyptic number.

It is an amenable number.

28276861 is a deficient number, since it is larger than the sum of its proper divisors (1).

28276861 is an equidigital number, since it uses as much as digits as its factorization.

28276861 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 64512, while the sum is 40.

The square root of 28276861 is about 5317.5991763201. The cubic root of 28276861 is about 304.6564653080.

The spelling of 28276861 in words is "twenty-eight million, two hundred seventy-six thousand, eight hundred sixty-one".