680802640 has 40 divisors (see below), whose sum is σ = 1808991360. Its totient is φ = 233417856.

The previous prime is 680802631. The next prime is 680802643. The reversal of 680802640 is 46208086.

It is a tau number, because it is divible by the number of its divisors (40).

It is a junction number, because it is equal to n+sod(n) for n = 680802596 and 680802605.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (680802643) 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, 607300 + ... + 608419.

It is an arithmetic number, because the mean of its divisors is an integer number (45224784).

Almost surely, 2^680802640 is an apocalyptic number.

It is an amenable number.

680802640 is an abundant number, since it is smaller than the sum of its proper divisors (1128188720).

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

680802640 is a wasteful number, since it uses less digits than its factorization.

680802640 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1215739 (or 1215733 counting only the distinct ones).

The product of its (nonzero) digits is 18432, while the sum is 34.

The square root of 680802640 is about 26092.1950015709. The cubic root of 680802640 is about 879.7117857808.

The spelling of 680802640 in words is "six hundred eighty million, eight hundred two thousand, six hundred forty".