649338650 has 36 divisors (see below), whose sum is σ = 1225043802. Its totient is φ = 256072320.

The previous prime is 649338637. The next prime is 649338653. The reversal of 649338650 is 56833946.

649338650 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 9 ways, for example, as 200703889 + 448634761 = 14167^2 + 21181^2 .

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (649338653) by changing a digit.

It is a polite number, since it can be written in 17 ways as a sum of consecutive naturals, for example, 265232 + ... + 267668.

Almost surely, 2^649338650 is an apocalyptic number.

649338650 is a deficient number, since it is larger than the sum of its proper divisors (575705152).

649338650 is a wasteful number, since it uses less digits than its factorization.

649338650 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2595 (or 2517 counting only the distinct ones).

The product of its (nonzero) digits is 466560, while the sum is 44.

The square root of 649338650 is about 25482.1241265323. The cubic root of 649338650 is about 865.9452173208.

The spelling of 649338650 in words is "six hundred forty-nine million, three hundred thirty-eight thousand, six hundred fifty".