28078752617 has 2 divisors, whose sum is σ = 28078752618. Its totient is φ = 28078752616.

The previous prime is 28078752607. The next prime is 28078752623. The reversal of 28078752617 is 71625787082.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 24115294681 + 3963457936 = 155291^2 + 62956^2 .

It is a cyclic number.

It is not a de Polignac number, because 28078752617 - 2²² = 28074558313 is a prime.

It is not a weakly prime, because it can be changed into another prime (28078752607) 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 as a sum of consecutive naturals, namely, 14039376308 + 14039376309.

It is an arithmetic number, because the mean of its divisors is an integer number (14039376309).

Almost surely, 2^28078752617 is an apocalyptic number.

It is an amenable number.

28078752617 is a deficient number, since it is larger than the sum of its proper divisors (1).

28078752617 is an equidigital number, since it uses as much as digits as its factorization.

28078752617 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 2634240, while the sum is 53.

The spelling of 28078752617 in words is "twenty-eight billion, seventy-eight million, seven hundred fifty-two thousand, six hundred seventeen".