28648716517 has 4 divisors (see below), whose sum is σ = 28685779020. Its totient is φ = 28611654016.

The previous prime is 28648716493. The next prime is 28648716539. The reversal of 28648716517 is 71561784682.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 2596819681 + 26051896836 = 50959^2 + 161406^2 .

It is a cyclic number.

It is not a de Polignac number, because 28648716517 - 2²³ = 28640327909 is a prime.

It is a super-2 number, since 2×28648716517² (a number of 22 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28648716017) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 18530092 + ... + 18531637.

It is an arithmetic number, because the mean of its divisors is an integer number (7171444755).

Almost surely, 2^28648716517 is an apocalyptic number.

It is an amenable number.

28648716517 is a deficient number, since it is larger than the sum of its proper divisors (37062503).

28648716517 is an equidigital number, since it uses as much as digits as its factorization.

28648716517 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 37062502.

The product of its digits is 4515840, while the sum is 55.

The spelling of 28648716517 in words is "twenty-eight billion, six hundred forty-eight million, seven hundred sixteen thousand, five hundred seventeen".