28647702761 has 2 divisors, whose sum is σ = 28647702762. Its totient is φ = 28647702760.

The previous prime is 28647702691. The next prime is 28647702793. The reversal of 28647702761 is 16720774682.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 27305579536 + 1342123225 = 165244^2 + 36635^2 .

It is a cyclic number.

It is not a de Polignac number, because 28647702761 - 2¹⁰ = 28647701737 is a prime.

It is not a weakly prime, because it can be changed into another prime (28647705761) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 14323851380 + 14323851381.

It is an arithmetic number, because the mean of its divisors is an integer number (14323851381).

Almost surely, 2^28647702761 is an apocalyptic number.

It is an amenable number.

28647702761 is a deficient number, since it is larger than the sum of its proper divisors (1).

28647702761 is an equidigital number, since it uses as much as digits as its factorization.

28647702761 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1580544, while the sum is 50.

The spelling of 28647702761 in words is "twenty-eight billion, six hundred forty-seven million, seven hundred two thousand, seven hundred sixty-one".