28718761633 has 2 divisors, whose sum is σ = 28718761634. Its totient is φ = 28718761632.

The previous prime is 28718761613. The next prime is 28718761663. The reversal of 28718761633 is 33616781782.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 22270189824 + 6448571809 = 149232^2 + 80303^2 .

It is a cyclic number.

It is not a de Polignac number, because 28718761633 - 2⁵ = 28718761601 is a prime.

It is not a weakly prime, because it can be changed into another prime (28718761613) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 14359380816 + 14359380817.

It is an arithmetic number, because the mean of its divisors is an integer number (14359380817).

Almost surely, 2^28718761633 is an apocalyptic number.

It is an amenable number.

28718761633 is a deficient number, since it is larger than the sum of its proper divisors (1).

28718761633 is an equidigital number, since it uses as much as digits as its factorization.

28718761633 is an evil number, because the sum of its binary digits is even.

The product of its digits is 2032128, while the sum is 52.

The spelling of 28718761633 in words is "twenty-eight billion, seven hundred eighteen million, seven hundred sixty-one thousand, six hundred thirty-three".