28677689386891 has 4 divisors (see below), whose sum is σ = 28680395605792. Its totient is φ = 28674983167992.

The previous prime is 28677689386889. The next prime is 28677689386967. The reversal of 28677689386891 is 19868398677682.

It is a happy number.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 28677689386891 - 2¹ = 28677689386889 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (28677689386861) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1353093555 + ... + 1353114748.

It is an arithmetic number, because the mean of its divisors is an integer number (7170098901448).

Almost surely, 2^{28677689386891} is an apocalyptic number.

28677689386891 is a deficient number, since it is larger than the sum of its proper divisors (2706218901).

28677689386891 is a wasteful number, since it uses less digits than its factorization.

28677689386891 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2706218900.

The product of its digits is 21069103104, while the sum is 88.

The spelling of 28677689386891 in words is "twenty-eight trillion, six hundred seventy-seven billion, six hundred eighty-nine million, three hundred eighty-six thousand, eight hundred ninety-one".