647364561 has 16 divisors (see below), whose sum is σ = 915129600. Its totient is φ = 405915408.

The previous prime is 647364547. The next prime is 647364563. The reversal of 647364561 is 165463746.

It is not a de Polignac number, because 647364561 - 2²² = 643170257 is a prime.

It is not an unprimeable number, because it can be changed into a prime (647364563) 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 in 15 ways as a sum of consecutive naturals, for example, 32931 + ... + 48776.

It is an arithmetic number, because the mean of its divisors is an integer number (57195600).

Almost surely, 2^647364561 is an apocalyptic number.

It is an amenable number.

647364561 is a deficient number, since it is larger than the sum of its proper divisors (267765039).

647364561 is a wasteful number, since it uses less digits than its factorization.

647364561 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 81868.

The product of its digits is 362880, while the sum is 42.

The square root of 647364561 is about 25443.3598606788. The cubic root of 647364561 is about 865.0667911494.

The spelling of 647364561 in words is "six hundred forty-seven million, three hundred sixty-four thousand, five hundred sixty-one".