678722716672 has 352 divisors, whose sum is σ = 1826302351104. Its totient is φ = 243479347200.

The previous prime is 678722716669. The next prime is 678722716703. The reversal of 678722716672 is 276617227876.

It is a tau number, because it is divible by the number of its divisors (352).

It is a super-2 number, since 2×678722716672² (a number of 24 digits) contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 678722716672.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 657039868 + ... + 657040900.

It is an arithmetic number, because the mean of its divisors is an integer number (5188358952).

Almost surely, 2^678722716672 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 678722716672, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (913151175552).

678722716672 is an abundant number, since it is smaller than the sum of its proper divisors (1147579634432).

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

678722716672 is a wasteful number, since it uses less digits than its factorization.

678722716672 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1725 (or 1707 counting only the distinct ones).

The product of its digits is 33191424, while the sum is 61.

The spelling of 678722716672 in words is "six hundred seventy-eight billion, seven hundred twenty-two million, seven hundred sixteen thousand, six hundred seventy-two".