28840478897 has 2 divisors, whose sum is σ = 28840478898. Its totient is φ = 28840478896.

The previous prime is 28840478893. The next prime is 28840478929. The reversal of 28840478897 is 79887404882.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 27712593841 + 1127885056 = 166471^2 + 33584^2 .

It is a cyclic number.

It is not a de Polignac number, because 28840478897 - 2² = 28840478893 is a prime.

It is not a weakly prime, because it can be changed into another prime (28840478893) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 14420239448 + 14420239449.

It is an arithmetic number, because the mean of its divisors is an integer number (14420239449).

Almost surely, 2^28840478897 is an apocalyptic number.

It is an amenable number.

28840478897 is a deficient number, since it is larger than the sum of its proper divisors (1).

28840478897 is an equidigital number, since it uses as much as digits as its factorization.

28840478897 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 57802752, while the sum is 65.

The spelling of 28840478897 in words is "twenty-eight billion, eight hundred forty million, four hundred seventy-eight thousand, eight hundred ninety-seven".