28771811 has 2 divisors, whose sum is σ = 28771812. Its totient is φ = 28771810.

The previous prime is 28771807. The next prime is 28771817. The reversal of 28771811 is 11817782.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 28771811 - 2² = 28771807 is a prime.

It is not a weakly prime, because it can be changed into another prime (28771817) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 14385905 + 14385906.

It is an arithmetic number, because the mean of its divisors is an integer number (14385906).

Almost surely, 2^28771811 is an apocalyptic number.

28771811 is a deficient number, since it is larger than the sum of its proper divisors (1).

28771811 is an equidigital number, since it uses as much as digits as its factorization.

28771811 is an evil number, because the sum of its binary digits is even.

The product of its digits is 6272, while the sum is 35.

The square root of 28771811 is about 5363.9361480167. The cubic root of 28771811 is about 306.4237333826.

The spelling of 28771811 in words is "twenty-eight million, seven hundred seventy-one thousand, eight hundred eleven".