28155497647 has 2 divisors, whose sum is σ = 28155497648. Its totient is φ = 28155497646.

The previous prime is 28155497609. The next prime is 28155497659. The reversal of 28155497647 is 74679455182.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-28155497647 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 28155497591 and 28155497600.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (28155495647) 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, 14077748823 + 14077748824.

It is an arithmetic number, because the mean of its divisors is an integer number (14077748824).

Almost surely, 2^28155497647 is an apocalyptic number.

28155497647 is a deficient number, since it is larger than the sum of its proper divisors (1).

28155497647 is an equidigital number, since it uses as much as digits as its factorization.

28155497647 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 16934400, while the sum is 58.

The spelling of 28155497647 in words is "twenty-eight billion, one hundred fifty-five million, four hundred ninety-seven thousand, six hundred forty-seven".