28207771 has 2 divisors, whose sum is σ = 28207772. Its totient is φ = 28207770.

The previous prime is 28207763. The next prime is 28207793. The reversal of 28207771 is 17770282.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 28207771 - 2³ = 28207763 is a prime.

It is not a weakly prime, because it can be changed into another prime (28207721) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 14103885 + 14103886.

It is an arithmetic number, because the mean of its divisors is an integer number (14103886).

Almost surely, 2^28207771 is an apocalyptic number.

28207771 is a deficient number, since it is larger than the sum of its proper divisors (1).

28207771 is an equidigital number, since it uses as much as digits as its factorization.

28207771 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 10976, while the sum is 34.

The square root of 28207771 is about 5311.0988505205. The cubic root of 28207771 is about 304.4081364529.

The spelling of 28207771 in words is "twenty-eight million, two hundred seven thousand, seven hundred seventy-one".