649668793 has 4 divisors (see below), whose sum is σ = 650459008. Its totient is φ = 648878580.

The previous prime is 649668791. The next prime is 649668839. The reversal of 649668793 is 397866946.

649668793 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 649668793 - 2¹ = 649668791 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (649668791) 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, 393873 + ... + 395518.

It is an arithmetic number, because the mean of its divisors is an integer number (162614752).

Almost surely, 2^649668793 is an apocalyptic number.

It is an amenable number.

649668793 is a deficient number, since it is larger than the sum of its proper divisors (790215).

649668793 is an equidigital number, since it uses as much as digits as its factorization.

649668793 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 790214.

The product of its digits is 11757312, while the sum is 58.

The square root of 649668793 is about 25488.6012366312. The cubic root of 649668793 is about 866.0919498538.

The spelling of 649668793 in words is "six hundred forty-nine million, six hundred sixty-eight thousand, seven hundred ninety-three".