680064640 has 32 divisors (see below), whose sum is σ = 1625781060. Its totient is φ = 272025600.

The previous prime is 680064601. The next prime is 680064647. The reversal of 680064640 is 46460086.

It can be written as a sum of positive squares in 2 ways, for example, as 659051584 + 21013056 = 25672^2 + 4584^2 .

It is a tau number, because it is divible by the number of its divisors (32).

It is a junction number, because it is equal to n+sod(n) for n = 680064596 and 680064605.

It is not an unprimeable number, because it can be changed into a prime (680064647) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 530661 + ... + 531940.

Almost surely, 2^680064640 is an apocalyptic number.

It is an amenable number.

680064640 is an abundant number, since it is smaller than the sum of its proper divisors (945716420).

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

680064640 is a wasteful number, since it uses less digits than its factorization.

680064640 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1062620 (or 1062608 counting only the distinct ones).

The product of its (nonzero) digits is 27648, while the sum is 34.

The square root of 680064640 is about 26078.0490067796. The cubic root of 680064640 is about 879.3937973792.

The spelling of 680064640 in words is "six hundred eighty million, sixty-four thousand, six hundred forty".