28663384657 has 2 divisors, whose sum is σ = 28663384658. Its totient is φ = 28663384656.

The previous prime is 28663384649. The next prime is 28663384693. The reversal of 28663384657 is 75648336682.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 26122317376 + 2541067281 = 161624^2 + 50409^2 .

It is a cyclic number.

It is not a de Polignac number, because 28663384657 - 2³ = 28663384649 is a prime.

It is not a weakly prime, because it can be changed into another prime (28663384357) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 14331692328 + 14331692329.

It is an arithmetic number, because the mean of its divisors is an integer number (14331692329).

Almost surely, 2^28663384657 is an apocalyptic number.

It is an amenable number.

28663384657 is a deficient number, since it is larger than the sum of its proper divisors (1).

28663384657 is an equidigital number, since it uses as much as digits as its factorization.

28663384657 is an evil number, because the sum of its binary digits is even.

The product of its digits is 34836480, while the sum is 58.

The spelling of 28663384657 in words is "twenty-eight billion, six hundred sixty-three million, three hundred eighty-four thousand, six hundred fifty-seven".