28667575709 has 2 divisors, whose sum is σ = 28667575710. Its totient is φ = 28667575708.

The previous prime is 28667575669. The next prime is 28667575747. The reversal of 28667575709 is 90757576682.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 28231392484 + 436183225 = 168022^2 + 20885^2 .

It is a cyclic number.

It is not a de Polignac number, because 28667575709 - 2²⁰ = 28666527133 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (28667575309) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 14333787854 + 14333787855.

It is an arithmetic number, because the mean of its divisors is an integer number (14333787855).

Almost surely, 2^28667575709 is an apocalyptic number.

It is an amenable number.

28667575709 is a deficient number, since it is larger than the sum of its proper divisors (1).

28667575709 is an equidigital number, since it uses as much as digits as its factorization.

28667575709 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 44452800, while the sum is 62.

The spelling of 28667575709 in words is "twenty-eight billion, six hundred sixty-seven million, five hundred seventy-five thousand, seven hundred nine".