649782717 has 4 divisors (see below), whose sum is σ = 866376960. Its totient is φ = 433188476.

The previous prime is 649782701. The next prime is 649782739. The reversal of 649782717 is 717287946.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 649782717 - 2⁴ = 649782701 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 649782717.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (649782317) 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 3 ways as a sum of consecutive naturals, for example, 108297117 + ... + 108297122.

It is an arithmetic number, because the mean of its divisors is an integer number (216594240).

Almost surely, 2^649782717 is an apocalyptic number.

It is an amenable number.

649782717 is a deficient number, since it is larger than the sum of its proper divisors (216594243).

649782717 is a wasteful number, since it uses less digits than its factorization.

649782717 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 216594242.

The product of its digits is 1185408, while the sum is 51.

The square root of 649782717 is about 25490.8359415693. The cubic root of 649782717 is about 866.1425720034.

The spelling of 649782717 in words is "six hundred forty-nine million, seven hundred eighty-two thousand, seven hundred seventeen".