680656896 has 108 divisors (see below), whose sum is σ = 1969742502. Its totient is φ = 226492416.

The previous prime is 680656861. The next prime is 680656901. The reversal of 680656896 is 698656086.

It can be written as a sum of positive squares in only one way, i.e., 368640000 + 312016896 = 19200^2 + 17664^2 .

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (5) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 1179360 + ... + 1179936.

Almost surely, 2^680656896 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 680656896, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (984871251).

680656896 is an abundant number, since it is smaller than the sum of its proper divisors (1289085606).

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

680656896 is an frugal number, since it uses more digits than its factorization.

680656896 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 617 (or 582 counting only the distinct ones).

The product of its (nonzero) digits is 3732480, while the sum is 54.

The square root of 680656896 is about 26089.4019862472. The cubic root of 680656896 is about 879.6490060278.

The spelling of 680656896 in words is "six hundred eighty million, six hundred fifty-six thousand, eight hundred ninety-six".