68890023856 has 60 divisors (see below), whose sum is σ = 138380125000. Its totient is φ = 33222518784.

The previous prime is 68890023847. The next prime is 68890023907. The reversal of 68890023856 is 65832009886.

It is a happy number.

It is a junction number, because it is equal to n+sod(n) for n = 68890023797 and 68890023806.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 16804495 + ... + 16808593.

Almost surely, 2^68890023856 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 68890023856, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (69190062500).

68890023856 is an abundant number, since it is smaller than the sum of its proper divisors (69490101144).

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

68890023856 is a wasteful number, since it uses less digits than its factorization.

68890023856 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5414 (or 5379 counting only the distinct ones).

The product of its (nonzero) digits is 4976640, while the sum is 55.

The spelling of 68890023856 in words is "sixty-eight billion, eight hundred ninety million, twenty-three thousand, eight hundred fifty-six".