28486677809 has 2 divisors, whose sum is σ = 28486677810. Its totient is φ = 28486677808.

The previous prime is 28486677763. The next prime is 28486677823. The reversal of 28486677809 is 90877668482.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 28214592784 + 272085025 = 167972^2 + 16495^2 .

It is a cyclic number.

It is not a de Polignac number, because 28486677809 - 2⁸ = 28486677553 is a prime.

It is a super-2 number, since 2×28486677809² (a number of 22 digits) contains 22 as substring.

It is a Sophie Germain prime.

It is a Curzon number.

It is not a weakly prime, because it can be changed into another prime (28486677839) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 14243338904 + 14243338905.

It is an arithmetic number, because the mean of its divisors is an integer number (14243338905).

Almost surely, 2^28486677809 is an apocalyptic number.

It is an amenable number.

28486677809 is a deficient number, since it is larger than the sum of its proper divisors (1).

28486677809 is an equidigital number, since it uses as much as digits as its factorization.

28486677809 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 65028096, while the sum is 65.

The spelling of 28486677809 in words is "twenty-eight billion, four hundred eighty-six million, six hundred seventy-seven thousand, eight hundred nine".