2640633911928 has 192 divisors, whose sum is σ = 7646481928800. Its totient is φ = 820339384320.

The previous prime is 2640633911899. The next prime is 2640633911969. The reversal of 2640633911928 is 8291193360462.

2640633911928 is a `hidden beast` number, since 2 + 6 + 4 + 0 + 63 + 391 + 192 + 8 = 666.

2640633911928 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 265893123 + ... + 265903053.

Almost surely, 2^{2640633911928} 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 2640633911928, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (3823240964400).

2640633911928 is an abundant number, since it is smaller than the sum of its proper divisors (5005848016872).

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

2640633911928 is a wasteful number, since it uses less digits than its factorization.

2640633911928 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12062 (or 12055 counting only the distinct ones).

The product of its (nonzero) digits is 3359232, while the sum is 54.

The spelling of 2640633911928 in words is "two trillion, six hundred forty billion, six hundred thirty-three million, nine hundred eleven thousand, nine hundred twenty-eight".