28081801229 has 2 divisors, whose sum is σ = 28081801230. Its totient is φ = 28081801228.

The previous prime is 28081801193. The next prime is 28081801259. The reversal of 28081801229 is 92210818082.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 19655479204 + 8426322025 = 140198^2 + 91795^2 .

It is a cyclic number.

It is not a de Polignac number, because 28081801229 - 2²⁸ = 27813365773 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (28081801259) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 14040900614 + 14040900615.

It is an arithmetic number, because the mean of its divisors is an integer number (14040900615).

Almost surely, 2^28081801229 is an apocalyptic number.

It is an amenable number.

28081801229 is a deficient number, since it is larger than the sum of its proper divisors (1).

28081801229 is an equidigital number, since it uses as much as digits as its factorization.

28081801229 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 36864, while the sum is 41.

The spelling of 28081801229 in words is "twenty-eight billion, eighty-one million, eight hundred one thousand, two hundred twenty-nine".