649992768 has 56 divisors (see below), whose sum is σ = 1723327008. Its totient is φ = 216216576.

The previous prime is 649992767. The next prime is 649992769. The reversal of 649992768 is 867299946.

It is an interprime number because it is at equal distance from previous prime (649992767) and next prime (649992769).

It is not an unprimeable number, because it can be changed into a prime (649992767) 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 7 ways as a sum of consecutive naturals, for example, 97180 + ... + 103652.

Almost surely, 2^649992768 is an apocalyptic number.

It is an amenable number.

649992768 is an abundant number, since it is smaller than the sum of its proper divisors (1073334240).

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

649992768 is a wasteful number, since it uses less digits than its factorization.

649992768 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7011 (or 7001 counting only the distinct ones).

The product of its digits is 11757312, while the sum is 60.

The square root of 649992768 is about 25494.9557363805. The cubic root of 649992768 is about 866.2358926925.

The spelling of 649992768 in words is "six hundred forty-nine million, nine hundred ninety-two thousand, seven hundred sixty-eight".