649565636 has 24 divisors (see below), whose sum is σ = 1181550720. Its totient is φ = 312191712.

The previous prime is 649565629. The next prime is 649565639. The reversal of 649565636 is 636565946.

It is not an unprimeable number, because it can be changed into a prime (649565639) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 14156 + ... + 38723.

It is an arithmetic number, because the mean of its divisors is an integer number (49231280).

Almost surely, 2^649565636 is an apocalyptic number.

It is an amenable number.

649565636 is a deficient number, since it is larger than the sum of its proper divisors (531985084).

649565636 is a wasteful number, since it uses less digits than its factorization.

649565636 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 53003 (or 53001 counting only the distinct ones).

The product of its digits is 3499200, while the sum is 50.

The square root of 649565636 is about 25486.5775654559. The cubic root of 649565636 is about 866.0461069169.

The spelling of 649565636 in words is "six hundred forty-nine million, five hundred sixty-five thousand, six hundred thirty-six".