649809168 has 40 divisors (see below), whose sum is σ = 1694088000. Its totient is φ = 214614144.

The previous prime is 649809151. The next prime is 649809187. The reversal of 649809168 is 861908946.

It is a happy number.

It is a self number, because there is not a number n which added to its sum of digits gives 649809168.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 56868 + ... + 67331.

It is an arithmetic number, because the mean of its divisors is an integer number (42352200).

Almost surely, 2^649809168 is an apocalyptic number.

It is an amenable number.

649809168 is an abundant number, since it is smaller than the sum of its proper divisors (1044278832).

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

649809168 is a wasteful number, since it uses less digits than its factorization.

649809168 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 124319 (or 124313 counting only the distinct ones).

The product of its (nonzero) digits is 746496, while the sum is 51.

The square root of 649809168 is about 25491.3547698038. The cubic root of 649809168 is about 866.1543246635.

The spelling of 649809168 in words is "six hundred forty-nine million, eight hundred nine thousand, one hundred sixty-eight".