649228689 has 24 divisors (see below), whose sum is σ = 1023699040. Its totient is φ = 410036256.

The previous prime is 649228687. The next prime is 649228711. The reversal of 649228689 is 986822946.

It is a happy number.

It is not a de Polignac number, because 649228689 - 2¹ = 649228687 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (649228681) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 65692 + ... + 74925.

Almost surely, 2^649228689 is an apocalyptic number.

It is an amenable number.

649228689 is a deficient number, since it is larger than the sum of its proper divisors (374470351).

649228689 is a wasteful number, since it uses less digits than its factorization.

649228689 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 140651 (or 140639 counting only the distinct ones).

The product of its digits is 2985984, while the sum is 54.

The square root of 649228689 is about 25479.9664246247. The cubic root of 649228689 is about 865.8963339544.

The spelling of 649228689 in words is "six hundred forty-nine million, two hundred twenty-eight thousand, six hundred eighty-nine".