28778422147 has 2 divisors, whose sum is σ = 28778422148. Its totient is φ = 28778422146.

The previous prime is 28778422121. The next prime is 28778422201. The reversal of 28778422147 is 74122487782.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 28778422147 - 2⁷ = 28778422019 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 28778422094 and 28778422103.

It is not a weakly prime, because it can be changed into another prime (28778422747) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 14389211073 + 14389211074.

It is an arithmetic number, because the mean of its divisors is an integer number (14389211074).

Almost surely, 2^28778422147 is an apocalyptic number.

28778422147 is a deficient number, since it is larger than the sum of its proper divisors (1).

28778422147 is an equidigital number, since it uses as much as digits as its factorization.

28778422147 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 2809856, while the sum is 52.

The spelling of 28778422147 in words is "twenty-eight billion, seven hundred seventy-eight million, four hundred twenty-two thousand, one hundred forty-seven".