2647947857 has 2 divisors, whose sum is σ = 2647947858. Its totient is φ = 2647947856.

The previous prime is 2647947853. The next prime is 2647947889. The reversal of 2647947857 is 7587497462.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1935912001 + 712035856 = 43999^2 + 26684^2 .

It is a cyclic number.

It is not a de Polignac number, because 2647947857 - 2² = 2647947853 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 2647947796 and 2647947805.

It is not a weakly prime, because it can be changed into another prime (2647947853) 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, 1323973928 + 1323973929.

It is an arithmetic number, because the mean of its divisors is an integer number (1323973929).

Almost surely, 2^2647947857 is an apocalyptic number.

It is an amenable number.

2647947857 is a deficient number, since it is larger than the sum of its proper divisors (1).

2647947857 is an equidigital number, since it uses as much as digits as its factorization.

2647947857 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 23708160, while the sum is 59.

The square root of 2647947857 is about 51458.2146697687. The cubic root of 2647947857 is about 1383.4702023508.

The spelling of 2647947857 in words is "two billion, six hundred forty-seven million, nine hundred forty-seven thousand, eight hundred fifty-seven".