649439908 has 12 divisors (see below), whose sum is σ = 1223944540. Its totient is φ = 299741472.

The previous prime is 649439881. The next prime is 649439909. The reversal of 649439908 is 809934946.

649439908 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 2 ways, for example, as 90212004 + 559227904 = 9498^2 + 23648^2 .

It is a Harshad number since it is a multiple of its sum of digits (52), and also a Moran number because the ratio is a prime number: 12489229 = 649439908 / (6 + 4 + 9 + 4 + 3 + 9 + 9 + 0 + 8).

It is not an unprimeable number, because it can be changed into a prime (649439909) 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, 6244563 + ... + 6244666.

Almost surely, 2^649439908 is an apocalyptic number.

It is an amenable number.

649439908 is a deficient number, since it is larger than the sum of its proper divisors (574504632).

649439908 is a wasteful number, since it uses less digits than its factorization.

649439908 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12489246 (or 12489244 counting only the distinct ones).

The product of its (nonzero) digits is 1679616, while the sum is 52.

The square root of 649439908 is about 25484.1108928681. The cubic root of 649439908 is about 865.9902268719.

The spelling of 649439908 in words is "six hundred forty-nine million, four hundred thirty-nine thousand, nine hundred eight".