28178830717 has 2 divisors, whose sum is σ = 28178830718. Its totient is φ = 28178830716.

The previous prime is 28178830697. The next prime is 28178830741. The reversal of 28178830717 is 71703887182.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 17573744356 + 10605086361 = 132566^2 + 102981^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-28178830717 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (28178830417) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 14089415358 + 14089415359.

It is an arithmetic number, because the mean of its divisors is an integer number (14089415359).

Almost surely, 2^28178830717 is an apocalyptic number.

It is an amenable number.

28178830717 is a deficient number, since it is larger than the sum of its proper divisors (1).

28178830717 is an equidigital number, since it uses as much as digits as its factorization.

28178830717 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1053696, while the sum is 52.

The spelling of 28178830717 in words is "twenty-eight billion, one hundred seventy-eight million, eight hundred thirty thousand, seven hundred seventeen".