680778056 has 128 divisors (see below), whose sum is σ = 1655251200. Its totient is φ = 255467520.

The previous prime is 680778047. The next prime is 680778061. The reversal of 680778056 is 650877086.

It is a super-2 number, since 2×680778056² = 926917523062278272, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 680778056.

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, 1103060 + ... + 1103676.

It is an arithmetic number, because the mean of its divisors is an integer number (12931650).

Almost surely, 2^680778056 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 680778056, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (827625600).

680778056 is an abundant number, since it is smaller than the sum of its proper divisors (974473144).

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

680778056 is a wasteful number, since it uses less digits than its factorization.

680778056 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 727 (or 723 counting only the distinct ones).

The product of its (nonzero) digits is 564480, while the sum is 47.

The square root of 680778056 is about 26091.7238985852. The cubic root of 680778056 is about 879.7011967625.

The spelling of 680778056 in words is "six hundred eighty million, seven hundred seventy-eight thousand, fifty-six".