2639728966784 has 64 divisors (see below), whose sum is σ = 6472412399040. Its totient is φ = 1044288377856.

The previous prime is 2639728966781. The next prime is 2639728966807. The reversal of 2639728966784 is 4876698279362.

It is a tau number, because it is divible by the number of its divisors (64).

It is not an unprimeable number, because it can be changed into a prime (2639728966781) 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 7 ways as a sum of consecutive naturals, for example, 113300894 + ... + 113324189.

It is an arithmetic number, because the mean of its divisors is an integer number (101131443735).

Almost surely, 2^{2639728966784} is an apocalyptic number.

It is an amenable number.

2639728966784 is an abundant number, since it is smaller than the sum of its proper divisors (3832683432256).

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

2639728966784 is a wasteful number, since it uses less digits than its factorization.

2639728966784 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 226625117 (or 226625105 counting only the distinct ones).

The product of its digits is 2633637888, while the sum is 77.

The spelling of 2639728966784 in words is "two trillion, six hundred thirty-nine billion, seven hundred twenty-eight million, nine hundred sixty-six thousand, seven hundred eighty-four".