649689007730784 has 768 divisors, whose sum is σ = 2234737374105600. Its totient is φ = 160838353944576.

The previous prime is 649689007730783. The next prime is 649689007730809. The reversal of 649689007730784 is 487037700986946.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (649689007730783) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 127 ways as a sum of consecutive naturals, for example, 2415344652 + ... + 2415613620.

It is an arithmetic number, because the mean of its divisors is an integer number (2909814289200).

Almost surely, 2^{649689007730784} is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 649689007730784, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1117368687052800).

649689007730784 is an abundant number, since it is smaller than the sum of its proper divisors (1585048366374816).

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

649689007730784 is a wasteful number, since it uses less digits than its factorization.

649689007730784 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 269375 (or 269367 counting only the distinct ones).

The product of its (nonzero) digits is 3072577536, while the sum is 78.

The spelling of 649689007730784 in words is "six hundred forty-nine trillion, six hundred eighty-nine billion, seven million, seven hundred thirty thousand, seven hundred eighty-four".