649886664 has 64 divisors (see below), whose sum is σ = 1860387840. Its totient is φ = 185325120.

The previous prime is 649886663. The next prime is 649886681. The reversal of 649886664 is 466688946.

It is not an unprimeable number, because it can be changed into a prime (649886663) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 91149 + ... + 98019.

It is an arithmetic number, because the mean of its divisors is an integer number (29068560).

Almost surely, 2^649886664 is an apocalyptic number.

It is an amenable number.

649886664 is an abundant number, since it is smaller than the sum of its proper divisors (1210501176).

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

649886664 is a wasteful number, since it uses less digits than its factorization.

649886664 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7450 (or 7446 counting only the distinct ones).

The product of its digits is 11943936, while the sum is 57.

The square root of 649886664 is about 25492.8747692370. The cubic root of 649886664 is about 866.1887557092.

The spelling of 649886664 in words is "six hundred forty-nine million, eight hundred eighty-six thousand, six hundred sixty-four".