28708405777 has 2 divisors, whose sum is σ = 28708405778. Its totient is φ = 28708405776.

The previous prime is 28708405703. The next prime is 28708405793. The reversal of 28708405777 is 77750480782.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 28613752336 + 94653441 = 169156^2 + 9729^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-28708405777 is a prime.

It is not a weakly prime, because it can be changed into another prime (28708405477) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 14354202888 + 14354202889.

It is an arithmetic number, because the mean of its divisors is an integer number (14354202889).

Almost surely, 2^28708405777 is an apocalyptic number.

It is an amenable number.

28708405777 is a deficient number, since it is larger than the sum of its proper divisors (1).

28708405777 is an equidigital number, since it uses as much as digits as its factorization.

28708405777 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 6146560, while the sum is 55.

The spelling of 28708405777 in words is "twenty-eight billion, seven hundred eight million, four hundred five thousand, seven hundred seventy-seven".