28889773289081 has 2 divisors, whose sum is σ = 28889773289082. Its totient is φ = 28889773289080.

The previous prime is 28889773289077. The next prime is 28889773289089. The reversal of 28889773289081 is 18098237798882.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 19048502362681 + 9841270926400 = 4364459^2 + 3137080^2 .

It is a cyclic number.

It is not a de Polignac number, because 28889773289081 - 2² = 28889773289077 is a prime.

It is a super-2 number, since 2×28889773289081² (a number of 28 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 28889773288987 and 28889773289005.

It is not a weakly prime, because it can be changed into another prime (28889773289089) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 14444886644540 + 14444886644541.

It is an arithmetic number, because the mean of its divisors is an integer number (14444886644541).

Almost surely, 2^{28889773289081} is an apocalyptic number.

It is an amenable number.

28889773289081 is a deficient number, since it is larger than the sum of its proper divisors (1).

28889773289081 is an equidigital number, since it uses as much as digits as its factorization.

28889773289081 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1560674304, while the sum is 80.

The spelling of 28889773289081 in words is "twenty-eight trillion, eight hundred eighty-nine billion, seven hundred seventy-three million, two hundred eighty-nine thousand, eighty-one".