28880761993 has 2 divisors, whose sum is σ = 28880761994. Its totient is φ = 28880761992.

The previous prime is 28880761879. The next prime is 28880761997. The reversal of 28880761993 is 39916708882.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 28605633424 + 275128569 = 169132^2 + 16587^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-28880761993 is a prime.

It is not a weakly prime, because it can be changed into another prime (28880761997) 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, 14440380996 + 14440380997.

It is an arithmetic number, because the mean of its divisors is an integer number (14440380997).

Almost surely, 2^28880761993 is an apocalyptic number.

It is an amenable number.

28880761993 is a deficient number, since it is larger than the sum of its proper divisors (1).

28880761993 is an equidigital number, since it uses as much as digits as its factorization.

28880761993 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 10450944, while the sum is 61.

The spelling of 28880761993 in words is "twenty-eight billion, eight hundred eighty million, seven hundred sixty-one thousand, nine hundred ninety-three".