28078733897 has 2 divisors, whose sum is σ = 28078733898. Its totient is φ = 28078733896.

The previous prime is 28078733821. The next prime is 28078733899. The reversal of 28078733897 is 79833787082.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 26175680521 + 1903053376 = 161789^2 + 43624^2 .

It is a cyclic number.

It is not a de Polignac number, because 28078733897 - 2³⁰ = 27004992073 is a prime.

Together with 28078733899, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (28078733899) 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, 14039366948 + 14039366949.

It is an arithmetic number, because the mean of its divisors is an integer number (14039366949).

Almost surely, 2^28078733897 is an apocalyptic number.

It is an amenable number.

28078733897 is a deficient number, since it is larger than the sum of its proper divisors (1).

28078733897 is an equidigital number, since it uses as much as digits as its factorization.

28078733897 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 28449792, while the sum is 62.

The spelling of 28078733897 in words is "twenty-eight billion, seventy-eight million, seven hundred thirty-three thousand, eight hundred ninety-seven".