28570811 has 2 divisors, whose sum is σ = 28570812. Its totient is φ = 28570810.

The previous prime is 28570793. The next prime is 28570837. The reversal of 28570811 is 11807582.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 28570811 - 2¹⁸ = 28308667 is a prime.

It is not a weakly prime, because it can be changed into another prime (28570111) 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, 14285405 + 14285406.

It is an arithmetic number, because the mean of its divisors is an integer number (14285406).

Almost surely, 2^28570811 is an apocalyptic number.

28570811 is a deficient number, since it is larger than the sum of its proper divisors (1).

28570811 is an equidigital number, since it uses as much as digits as its factorization.

28570811 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 4480, while the sum is 32.

The square root of 28570811 is about 5345.1670694189. The cubic root of 28570811 is about 305.7085060714.

The spelling of 28570811 in words is "twenty-eight million, five hundred seventy thousand, eight hundred eleven".