28668285777 has 4 divisors (see below), whose sum is σ = 38224381040. Its totient is φ = 19112190516.

The previous prime is 28668285731. The next prime is 28668285817. The reversal of 28668285777 is 77758286682.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is not a de Polignac number, because 28668285777 - 2⁷ = 28668285649 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (28668285707) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 4778047627 + ... + 4778047632.

It is an arithmetic number, because the mean of its divisors is an integer number (9556095260).

Almost surely, 2^28668285777 is an apocalyptic number.

It is an amenable number.

28668285777 is a deficient number, since it is larger than the sum of its proper divisors (9556095263).

28668285777 is an equidigital number, since it uses as much as digits as its factorization.

28668285777 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9556095262.

The product of its digits is 126443520, while the sum is 66.

The spelling of 28668285777 in words is "twenty-eight billion, six hundred sixty-eight million, two hundred eighty-five thousand, seven hundred seventy-seven".