680569640 has 32 divisors (see below), whose sum is σ = 1532229480. Its totient is φ = 272059392.

The previous prime is 680569627. The next prime is 680569649. The reversal of 680569640 is 46965086.

It can be written as a sum of positive squares in 4 ways, for example, as 670084996 + 10484644 = 25886^2 + 3238^2 .

It is a junction number, because it is equal to n+sod(n) for n = 680569591 and 680569600.

It is not an unprimeable number, because it can be changed into a prime (680569649) 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 7 ways as a sum of consecutive naturals, for example, 75452 + ... + 83988.

Almost surely, 2^680569640 is an apocalyptic number.

It is an amenable number.

680569640 is an abundant number, since it is smaller than the sum of its proper divisors (851659840).

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

680569640 is a wasteful number, since it uses less digits than its factorization.

680569640 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10541 (or 10537 counting only the distinct ones).

The product of its (nonzero) digits is 311040, while the sum is 44.

The square root of 680569640 is about 26087.7296827455. The cubic root of 680569640 is about 879.6114159026.

The spelling of 680569640 in words is "six hundred eighty million, five hundred sixty-nine thousand, six hundred forty".