68375923640 has 64 divisors (see below), whose sum is σ = 156948645600. Its totient is φ = 26801694208.

The previous prime is 68375923579. The next prime is 68375923661. The reversal of 68375923640 is 4632957386.

It is a happy number.

It is a super-2 number, since 2×68375923640² (a number of 22 digits) contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 702422 + ... + 793818.

Almost surely, 2^68375923640 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 68375923640, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (78474322800).

68375923640 is an abundant number, since it is smaller than the sum of its proper divisors (88572721960).

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

68375923640 is a wasteful number, since it uses less digits than its factorization.

68375923640 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 91784 (or 91780 counting only the distinct ones).

The product of its (nonzero) digits is 6531840, while the sum is 53.

The spelling of 68375923640 in words is "sixty-eight billion, three hundred seventy-five million, nine hundred twenty-three thousand, six hundred forty".