68388972640 has 24 divisors (see below), whose sum is σ = 161568948240. Its totient is φ = 27355588992.

The previous prime is 68388972599. The next prime is 68388972661. The reversal of 68388972640 is 4627988386.

68388972640 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 3 ways as a sum of consecutive naturals, for example, 213715380 + ... + 213715699.

It is an arithmetic number, because the mean of its divisors is an integer number (6732039510).

Almost surely, 2^68388972640 is an apocalyptic number.

It is an amenable number.

68388972640 is an abundant number, since it is smaller than the sum of its proper divisors (93179975600).

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

68388972640 is a wasteful number, since it uses less digits than its factorization.

68388972640 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 427431094 (or 427431086 counting only the distinct ones).

The product of its (nonzero) digits is 27869184, while the sum is 61.

The spelling of 68388972640 in words is "sixty-eight billion, three hundred eighty-eight million, nine hundred seventy-two thousand, six hundred forty".