28420811 has 2 divisors, whose sum is σ = 28420812. Its totient is φ = 28420810.

The previous prime is 28420771. The next prime is 28420813. The reversal of 28420811 is 11802482.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 28420811 - 2⁶ = 28420747 is a prime.

Together with 28420813, 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 (28420813) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 14210405 + 14210406.

It is an arithmetic number, because the mean of its divisors is an integer number (14210406).

Almost surely, 2^28420811 is an apocalyptic number.

28420811 is a deficient number, since it is larger than the sum of its proper divisors (1).

28420811 is an equidigital number, since it uses as much as digits as its factorization.

28420811 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1024, while the sum is 26.

The square root of 28420811 is about 5331.1172375028. The cubic root of 28420811 is about 305.1725656084.

The spelling of 28420811 in words is "twenty-eight million, four hundred twenty thousand, eight hundred eleven".