28121060677 has 2 divisors, whose sum is σ = 28121060678. Its totient is φ = 28121060676.

The previous prime is 28121060623. The next prime is 28121060683. The reversal of 28121060677 is 77606012182.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 28116247041 + 4813636 = 167679^2 + 2194^2 .

It is a cyclic number.

It is not a de Polignac number, because 28121060677 - 2⁷ = 28121060549 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (28121060477) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 14060530338 + 14060530339.

It is an arithmetic number, because the mean of its divisors is an integer number (14060530339).

Almost surely, 2^28121060677 is an apocalyptic number.

It is an amenable number.

28121060677 is a deficient number, since it is larger than the sum of its proper divisors (1).

28121060677 is an equidigital number, since it uses as much as digits as its factorization.

28121060677 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 56448, while the sum is 40.

The spelling of 28121060677 in words is "twenty-eight billion, one hundred twenty-one million, sixty thousand, six hundred seventy-seven".