28880887897 has 2 divisors, whose sum is σ = 28880887898. Its totient is φ = 28880887896.

The previous prime is 28880887879. The next prime is 28880887921. The reversal of 28880887897 is 79878808882.

Together with previous prime (28880887879) it forms an Ormiston pair, because they use the same digits, order apart.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 25940645721 + 2940242176 = 161061^2 + 54224^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-28880887897 is a prime.

It is not a weakly prime, because it can be changed into another prime (28880837897) 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, 14440443948 + 14440443949.

It is an arithmetic number, because the mean of its divisors is an integer number (14440443949).

Almost surely, 2^28880887897 is an apocalyptic number.

It is an amenable number.

28880887897 is a deficient number, since it is larger than the sum of its proper divisors (1).

28880887897 is an equidigital number, since it uses as much as digits as its factorization.

28880887897 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 231211008, while the sum is 73.

The spelling of 28880887897 in words is "twenty-eight billion, eight hundred eighty million, eight hundred eighty-seven thousand, eight hundred ninety-seven".