68478265856 has 320 divisors, whose sum is σ = 187246515456. Its totient is φ = 24153292800.

The previous prime is 68478265771. The next prime is 68478265871. The reversal of 68478265856 is 65856287486.

It is a super-3 number, since 3×68478265856³ (a number of 33 digits) contains 333 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 68478265792 and 68478265801.

It is an unprimeable number.

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 31 ways as a sum of consecutive naturals, for example, 27161876 + ... + 27164396.

Almost surely, 2^68478265856 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 68478265856, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (93623257728).

68478265856 is an abundant number, since it is smaller than the sum of its proper divisors (118768249600).

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

68478265856 is a wasteful number, since it uses less digits than its factorization.

68478265856 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2623 (or 2607 counting only the distinct ones).

The product of its digits is 154828800, while the sum is 65.

The spelling of 68478265856 in words is "sixty-eight billion, four hundred seventy-eight million, two hundred sixty-five thousand, eight hundred fifty-six".