28856766877 has 2 divisors, whose sum is σ = 28856766878. Its totient is φ = 28856766876.

The previous prime is 28856766779. The next prime is 28856766893. The reversal of 28856766877 is 77866765882.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 28782479716 + 74287161 = 169654^2 + 8619^2 .

It is a cyclic number.

It is not a de Polignac number, because 28856766877 - 2⁷ = 28856766749 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (28856766077) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 14428383438 + 14428383439.

It is an arithmetic number, because the mean of its divisors is an integer number (14428383439).

Almost surely, 2^28856766877 is an apocalyptic number.

It is an amenable number.

28856766877 is a deficient number, since it is larger than the sum of its proper divisors (1).

28856766877 is an equidigital number, since it uses as much as digits as its factorization.

28856766877 is an evil number, because the sum of its binary digits is even.

The product of its digits is 379330560, while the sum is 70.

The spelling of 28856766877 in words is "twenty-eight billion, eight hundred fifty-six million, seven hundred sixty-six thousand, eight hundred seventy-seven".