28855861 has 2 divisors, whose sum is σ = 28855862. Its totient is φ = 28855860.

The previous prime is 28855843. The next prime is 28855873. The reversal of 28855861 is 16855882.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 25948836 + 2907025 = 5094^2 + 1705^2 .

It is a cyclic number.

It is not a de Polignac number, because 28855861 - 2⁵ = 28855829 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (28855811) 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, 14427930 + 14427931.

It is an arithmetic number, because the mean of its divisors is an integer number (14427931).

Almost surely, 2^28855861 is an apocalyptic number.

It is an amenable number.

28855861 is a deficient number, since it is larger than the sum of its proper divisors (1).

28855861 is an equidigital number, since it uses as much as digits as its factorization.

28855861 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 153600, while the sum is 43.

The square root of 28855861 is about 5371.7651661256. The cubic root of 28855861 is about 306.7218246458.

The spelling of 28855861 in words is "twenty-eight million, eight hundred fifty-five thousand, eight hundred sixty-one".