28778068801 has 2 divisors, whose sum is σ = 28778068802. Its totient is φ = 28778068800.

The previous prime is 28778068799. The next prime is 28778068841. The reversal of 28778068801 is 10886087782.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 18713966401 + 10064102400 = 136799^2 + 100320^2 .

It is a cyclic number.

It is not a de Polignac number, because 28778068801 - 2¹ = 28778068799 is a prime.

Together with 28778068799, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (28778068841) 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, 14389034400 + 14389034401.

It is an arithmetic number, because the mean of its divisors is an integer number (14389034401).

Almost surely, 2^28778068801 is an apocalyptic number.

It is an amenable number.

28778068801 is a deficient number, since it is larger than the sum of its proper divisors (1).

28778068801 is an equidigital number, since it uses as much as digits as its factorization.

28778068801 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 2408448, while the sum is 55.

The spelling of 28778068801 in words is "twenty-eight billion, seven hundred seventy-eight million, sixty-eight thousand, eight hundred one".