647663587 has 2 divisors, whose sum is σ = 647663588. Its totient is φ = 647663586.

The previous prime is 647663579. The next prime is 647663663. The reversal of 647663587 is 785366746.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 647663587 - 2³ = 647663579 is a prime.

It is not a weakly prime, because it can be changed into another prime (647663287) 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, 323831793 + 323831794.

It is an arithmetic number, because the mean of its divisors is an integer number (323831794).

Almost surely, 2^647663587 is an apocalyptic number.

647663587 is a deficient number, since it is larger than the sum of its proper divisors (1).

647663587 is an equidigital number, since it uses as much as digits as its factorization.

647663587 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 5080320, while the sum is 52.

The square root of 647663587 is about 25449.2354894995. The cubic root of 647663587 is about 865.1999657979.

The spelling of 647663587 in words is "six hundred forty-seven million, six hundred sixty-three thousand, five hundred eighty-seven".