649907208 has 48 divisors (see below), whose sum is σ = 1761849180. Its totient is φ = 216428544.

The previous prime is 649907207. The next prime is 649907221. The reversal of 649907208 is 802709946.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 645058404 + 4848804 = 25398^2 + 2202^2 .

It is not an unprimeable number, because it can be changed into a prime (649907207) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 83916 + ... + 91332.

Almost surely, 2^649907208 is an apocalyptic number.

It is an amenable number.

649907208 is an abundant number, since it is smaller than the sum of its proper divisors (1111941972).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

649907208 is a wasteful number, since it uses less digits than its factorization.

649907208 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8646 (or 8639 counting only the distinct ones).

The product of its (nonzero) digits is 217728, while the sum is 45.

The square root of 649907208 is about 25493.2777021708. The cubic root of 649907208 is about 866.1978828361.

The spelling of 649907208 in words is "six hundred forty-nine million, nine hundred seven thousand, two hundred eight".