649239912 has 24 divisors (see below), whose sum is σ = 1758358290. Its totient is φ = 216413280.

The previous prime is 649239893. The next prime is 649239919. The reversal of 649239912 is 219932946.

It is a happy number.

649239912 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 only one way, i.e., 443776356 + 205463556 = 21066^2 + 14334^2 .

It is a tau number, because it is divible by the number of its divisors (24).

It is a nude number because it is divisible by every one of its digits.

It is not an unprimeable number, because it can be changed into a prime (649239919) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 4508539 + ... + 4508682.

Almost surely, 2^649239912 is an apocalyptic number.

It is an amenable number.

649239912 is an abundant number, since it is smaller than the sum of its proper divisors (1109118378).

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

649239912 is a wasteful number, since it uses less digits than its factorization.

649239912 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9017233 (or 9017226 counting only the distinct ones).

The product of its digits is 209952, while the sum is 45.

The square root of 649239912 is about 25480.1866555173. The cubic root of 649239912 is about 865.9013234128.

The spelling of 649239912 in words is "six hundred forty-nine million, two hundred thirty-nine thousand, nine hundred twelve".