649963568 has 20 divisors (see below), whose sum is σ = 1259856120. Its totient is φ = 324839424.

The previous prime is 649963549. The next prime is 649963627. The reversal of 649963568 is 865369946.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 35471 + ... + 50577.

It is an arithmetic number, because the mean of its divisors is an integer number (62992806).

Almost surely, 2^649963568 is an apocalyptic number.

It is an amenable number.

649963568 is a deficient number, since it is larger than the sum of its proper divisors (609892552).

649963568 is a wasteful number, since it uses less digits than its factorization.

649963568 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 17804 (or 17798 counting only the distinct ones).

The product of its digits is 8398080, while the sum is 56.

The square root of 649963568 is about 25494.3830676485. The cubic root of 649963568 is about 866.2229210267. Note that the first 3 decimals are identical.

The spelling of 649963568 in words is "six hundred forty-nine million, nine hundred sixty-three thousand, five hundred sixty-eight".