649259327868 has 48 divisors (see below), whose sum is σ = 1595770350720. Its totient is φ = 204888049344.

The previous prime is 649259327861. The next prime is 649259327869. The reversal of 649259327868 is 868723952946.

It is a happy number.

It is a hoax number, since the sum of its digits (69) coincides with the sum of the digits of its distinct prime factors.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (649259327861) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 648630 + ... + 1311197.

It is an arithmetic number, because the mean of its divisors is an integer number (33245215640).

Almost surely, 2^649259327868 is an apocalyptic number.

It is an amenable number.

649259327868 is an abundant number, since it is smaller than the sum of its proper divisors (946511022852).

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

649259327868 is a wasteful number, since it uses less digits than its factorization.

649259327868 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1961306 (or 1961304 counting only the distinct ones).

The product of its digits is 313528320, while the sum is 69.

The spelling of 649259327868 in words is "six hundred forty-nine billion, two hundred fifty-nine million, three hundred twenty-seven thousand, eight hundred sixty-eight".