28011773617 has 2 divisors, whose sum is σ = 28011773618. Its totient is φ = 28011773616.

The previous prime is 28011773567. The next prime is 28011773651. The reversal of 28011773617 is 71637711082.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 21437645056 + 6574128561 = 146416^2 + 81081^2 .

It is a cyclic number.

It is not a de Polignac number, because 28011773617 - 2¹¹ = 28011771569 is a prime.

It is a super-2 number, since 2×28011773617² (a number of 22 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (28011773417) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 14005886808 + 14005886809.

It is an arithmetic number, because the mean of its divisors is an integer number (14005886809).

Almost surely, 2^28011773617 is an apocalyptic number.

It is an amenable number.

28011773617 is a deficient number, since it is larger than the sum of its proper divisors (1).

28011773617 is an equidigital number, since it uses as much as digits as its factorization.

28011773617 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 98784, while the sum is 43.

The spelling of 28011773617 in words is "twenty-eight billion, eleven million, seven hundred seventy-three thousand, six hundred seventeen".