647421647 has 8 divisors (see below), whose sum is σ = 651490320. Its totient is φ = 643366080.

The previous prime is 647421629. The next prime is 647421653. The reversal of 647421647 is 746124746.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 647421647 - 2¹⁴ = 647405263 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (647421347) 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 7 ways as a sum of consecutive naturals, for example, 107147 + ... + 113027.

It is an arithmetic number, because the mean of its divisors is an integer number (81436290).

Almost surely, 2^647421647 is an apocalyptic number.

647421647 is a deficient number, since it is larger than the sum of its proper divisors (4068673).

647421647 is a wasteful number, since it uses less digits than its factorization.

647421647 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6553.

The product of its digits is 225792, while the sum is 41.

The square root of 647421647 is about 25444.4816610596. The cubic root of 647421647 is about 865.0922182190.

The spelling of 647421647 in words is "six hundred forty-seven million, four hundred twenty-one thousand, six hundred forty-seven".