28778422201 has 2 divisors, whose sum is σ = 28778422202. Its totient is φ = 28778422200.

The previous prime is 28778422147. The next prime is 28778422229. The reversal of 28778422201 is 10222487782.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 23353952400 + 5424469801 = 152820^2 + 73651^2 .

It is a cyclic number.

It is not a de Polignac number, because 28778422201 - 2¹³ = 28778414009 is a prime.

It is not a weakly prime, because it can be changed into another prime (28778422501) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 14389211100 + 14389211101.

It is an arithmetic number, because the mean of its divisors is an integer number (14389211101).

Almost surely, 2^28778422201 is an apocalyptic number.

It is an amenable number.

28778422201 is a deficient number, since it is larger than the sum of its proper divisors (1).

28778422201 is an equidigital number, since it uses as much as digits as its factorization.

28778422201 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 200704, while the sum is 43.

The spelling of 28778422201 in words is "twenty-eight billion, seven hundred seventy-eight million, four hundred twenty-two thousand, two hundred one".