649697759 has 4 divisors (see below), whose sum is σ = 672101160. Its totient is φ = 627294360.

The previous prime is 649697753. The next prime is 649697771. The reversal of 649697759 is 957796946.

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

It is not a de Polignac number, because 649697759 - 2⁴ = 649697743 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 (649697753) 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, 11201657 + ... + 11201714.

It is an arithmetic number, because the mean of its divisors is an integer number (168025290).

Almost surely, 2^649697759 is an apocalyptic number.

649697759 is a deficient number, since it is larger than the sum of its proper divisors (22403401).

649697759 is a wasteful number, since it uses less digits than its factorization.

649697759 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 22403400.

The product of its digits is 25719120, while the sum is 62.

The square root of 649697759 is about 25489.1694450800. The cubic root of 649697759 is about 866.1048214621.

The spelling of 649697759 in words is "six hundred forty-nine million, six hundred ninety-seven thousand, seven hundred fifty-nine".