28728728617 has 2 divisors, whose sum is σ = 28728728618. Its totient is φ = 28728728616.

The previous prime is 28728728603. The next prime is 28728728627. The reversal of 28728728617 is 71682782782.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 22217691136 + 6511037481 = 149056^2 + 80691^2 .

It is a cyclic number.

It is not a de Polignac number, because 28728728617 - 2²³ = 28720340009 is a prime.

It is a super-3 number, since 3×28728728617³ (a number of 32 digits) contains 333 as substring.

It is not a weakly prime, because it can be changed into another prime (28728728627) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 14364364308 + 14364364309.

It is an arithmetic number, because the mean of its divisors is an integer number (14364364309).

Almost surely, 2^28728728617 is an apocalyptic number.

It is an amenable number.

28728728617 is a deficient number, since it is larger than the sum of its proper divisors (1).

28728728617 is an equidigital number, since it uses as much as digits as its factorization.

28728728617 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 8429568, while the sum is 58.

The spelling of 28728728617 in words is "twenty-eight billion, seven hundred twenty-eight million, seven hundred twenty-eight thousand, six hundred seventeen".