649887713 has 4 divisors (see below), whose sum is σ = 688116420. Its totient is φ = 611659008.

The previous prime is 649887703. The next prime is 649887727. The reversal of 649887713 is 317788946.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 333865984 + 316021729 = 18272^2 + 17777^2 .

It is a cyclic number.

It is not a de Polignac number, because 649887713 - 2⁶ = 649887649 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (649887703) 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, 19114328 + ... + 19114361.

It is an arithmetic number, because the mean of its divisors is an integer number (172029105).

Almost surely, 2^649887713 is an apocalyptic number.

It is an amenable number.

649887713 is a deficient number, since it is larger than the sum of its proper divisors (38228707).

649887713 is a wasteful number, since it uses less digits than its factorization.

649887713 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 38228706.

The product of its digits is 2032128, while the sum is 53.

The square root of 649887713 is about 25492.8953436050. The cubic root of 649887713 is about 866.1892217553.

The spelling of 649887713 in words is "six hundred forty-nine million, eight hundred eighty-seven thousand, seven hundred thirteen".