28506811 has 2 divisors, whose sum is σ = 28506812. Its totient is φ = 28506810.

The previous prime is 28506809. The next prime is 28506827. The reversal of 28506811 is 11860582.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 28506811 - 2¹ = 28506809 is a prime.

Together with 28506809, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (28506871) 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, 14253405 + 14253406.

It is an arithmetic number, because the mean of its divisors is an integer number (14253406).

Almost surely, 2^28506811 is an apocalyptic number.

28506811 is a deficient number, since it is larger than the sum of its proper divisors (1).

28506811 is an equidigital number, since it uses as much as digits as its factorization.

28506811 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 3840, while the sum is 31.

The square root of 28506811 is about 5339.1769965042. The cubic root of 28506811 is about 305.4800681305.

The spelling of 28506811 in words is "twenty-eight million, five hundred six thousand, eight hundred eleven".