680396646 has 16 divisors (see below), whose sum is σ = 1379435184. Its totient is φ = 223691904.

The previous prime is 680396641. The next prime is 680396657. The reversal of 680396646 is 646693086.

It is a junction number, because it is equal to n+sod(n) for n = 680396595 and 680396604.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (680396641) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 776271 + ... + 777146.

It is an arithmetic number, because the mean of its divisors is an integer number (86214699).

Almost surely, 2^680396646 is an apocalyptic number.

680396646 is an abundant number, since it is smaller than the sum of its proper divisors (699038538).

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

680396646 is a wasteful number, since it uses less digits than its factorization.

680396646 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1553495.

The product of its (nonzero) digits is 1119744, while the sum is 48.

The square root of 680396646 is about 26084.4138519538. The cubic root of 680396646 is about 879.5368801102.

The spelling of 680396646 in words is "six hundred eighty million, three hundred ninety-six thousand, six hundred forty-six".