680397340 has 72 divisors (see below), whose sum is σ = 1667085840. Its totient is φ = 232581888.

The previous prime is 680397317. The next prime is 680397343. The reversal of 680397340 is 43793086.

It is a junction number, because it is equal to n+sod(n) for n = 680397293 and 680397302.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (680397343) 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 23 ways as a sum of consecutive naturals, for example, 409792 + ... + 411448.

It is an arithmetic number, because the mean of its divisors is an integer number (23153970).

Almost surely, 2^680397340 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 680397340, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (833542920).

680397340 is an abundant number, since it is smaller than the sum of its proper divisors (986688500).

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

680397340 is a wasteful number, since it uses less digits than its factorization.

680397340 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2099 (or 2090 counting only the distinct ones).

The product of its (nonzero) digits is 108864, while the sum is 40.

The square root of 680397340 is about 26084.4271549137. The cubic root of 680397340 is about 879.5371791507.

The spelling of 680397340 in words is "six hundred eighty million, three hundred ninety-seven thousand, three hundred forty".