649762689 has 4 divisors (see below), whose sum is σ = 866350256. Its totient is φ = 433175124.

The previous prime is 649762621. The next prime is 649762721. The reversal of 649762689 is 986267946.

649762689 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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 not a de Polignac number, because 649762689 - 2⁹ = 649762177 is a prime.

It is a super-3 number, since 3×649762689³ (a number of 27 digits) contains 333 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (649762889) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 108293779 + ... + 108293784.

It is an arithmetic number, because the mean of its divisors is an integer number (216587564).

Almost surely, 2^649762689 is an apocalyptic number.

It is an amenable number.

649762689 is a deficient number, since it is larger than the sum of its proper divisors (216587567).

649762689 is a wasteful number, since it uses less digits than its factorization.

649762689 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 216587566.

The product of its digits is 7838208, while the sum is 57.

The square root of 649762689 is about 25490.4430914804. The cubic root of 649762689 is about 866.1336729867.

The spelling of 649762689 in words is "six hundred forty-nine million, seven hundred sixty-two thousand, six hundred eighty-nine".