649386689 has 16 divisors (see below), whose sum is σ = 786734208. Its totient is φ = 523260672.

The previous prime is 649386679. The next prime is 649386701. The reversal of 649386689 is 986683946.

649386689 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a cyclic number.

It is not a de Polignac number, because 649386689 - 2¹² = 649382593 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (649386649) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 117854 + ... + 123240.

It is an arithmetic number, because the mean of its divisors is an integer number (49170888).

Almost surely, 2^649386689 is an apocalyptic number.

It is an amenable number.

649386689 is a deficient number, since it is larger than the sum of its proper divisors (137347519).

649386689 is a wasteful number, since it uses less digits than its factorization.

649386689 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6424.

The product of its digits is 13436928, while the sum is 59.

The square root of 649386689 is about 25483.0667110534. The cubic root of 649386689 is about 865.9665714152.

The spelling of 649386689 in words is "six hundred forty-nine million, three hundred eighty-six thousand, six hundred eighty-nine".