28178142247 has 2 divisors, whose sum is σ = 28178142248. Its totient is φ = 28178142246.

The previous prime is 28178142211. The next prime is 28178142257. The reversal of 28178142247 is 74224187182.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-28178142247 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 28178142197 and 28178142206.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (28178142257) 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, 14089071123 + 14089071124.

It is an arithmetic number, because the mean of its divisors is an integer number (14089071124).

Almost surely, 2^28178142247 is an apocalyptic number.

28178142247 is a deficient number, since it is larger than the sum of its proper divisors (1).

28178142247 is an equidigital number, since it uses as much as digits as its factorization.

28178142247 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 401408, while the sum is 46.

The spelling of 28178142247 in words is "twenty-eight billion, one hundred seventy-eight million, one hundred forty-two thousand, two hundred forty-seven".