648389565 has 12 divisors (see below), whose sum is σ = 1123875324. Its totient is φ = 345807744.

The previous prime is 648389563. The next prime is 648389587. The reversal of 648389565 is 565983846.

It is a happy number.

648389565 is a `hidden beast` number, since 6 + 48 + 38 + 9 + 565 = 666.

It can be written as a sum of positive squares in 2 ways, for example, as 182736324 + 465653241 = 13518^2 + 21579^2 .

It is not a de Polignac number, because 648389565 - 2¹ = 648389563 is a prime.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (648389563) 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 in 11 ways as a sum of consecutive naturals, for example, 7204284 + ... + 7204373.

It is an arithmetic number, because the mean of its divisors is an integer number (93656277).

Almost surely, 2^648389565 is an apocalyptic number.

It is an amenable number.

648389565 is a deficient number, since it is larger than the sum of its proper divisors (475485759).

648389565 is a wasteful number, since it uses less digits than its factorization.

648389565 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 14408668 (or 14408665 counting only the distinct ones).

The product of its digits is 6220800, while the sum is 54.

The square root of 648389565 is about 25463.4947522920. The cubic root of 648389565 is about 865.5231179253.

The spelling of 648389565 in words is "six hundred forty-eight million, three hundred eighty-nine thousand, five hundred sixty-five".