647887763 has 2 divisors, whose sum is σ = 647887764. Its totient is φ = 647887762.

The previous prime is 647887733. The next prime is 647887787. The reversal of 647887763 is 367788746.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 647887763 - 2²⁰ = 646839187 is a prime.

It is a Sophie Germain prime.

It is a junction number, because it is equal to n+sod(n) for n = 647887699 and 647887708.

It is not a weakly prime, because it can be changed into another prime (647887703) 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, 323943881 + 323943882.

It is an arithmetic number, because the mean of its divisors is an integer number (323943882).

Almost surely, 2^647887763 is an apocalyptic number.

647887763 is a deficient number, since it is larger than the sum of its proper divisors (1).

647887763 is an equidigital number, since it uses as much as digits as its factorization.

647887763 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 9483264, while the sum is 56.

The square root of 647887763 is about 25453.6394843645. The cubic root of 647887763 is about 865.2997782611.

The spelling of 647887763 in words is "six hundred forty-seven million, eight hundred eighty-seven thousand, seven hundred sixty-three".