649718789 has 4 divisors (see below), whose sum is σ = 677967456. Its totient is φ = 621470124.

The previous prime is 649718753. The next prime is 649718791. The reversal of 649718789 is 987817946.

649718789 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 a cyclic number.

It is not a de Polignac number, because 649718789 - 2⁸ = 649718533 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 (649798789) 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, 14124299 + ... + 14124344.

It is an arithmetic number, because the mean of its divisors is an integer number (169491864).

Almost surely, 2^649718789 is an apocalyptic number.

It is an amenable number.

649718789 is a deficient number, since it is larger than the sum of its proper divisors (28248667).

649718789 is a wasteful number, since it uses less digits than its factorization.

649718789 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 28248666.

The product of its digits is 6096384, while the sum is 59.

The square root of 649718789 is about 25489.5819698951. The cubic root of 649718789 is about 866.1141663139.

The spelling of 649718789 in words is "six hundred forty-nine million, seven hundred eighteen thousand, seven hundred eighty-nine".