680813668 has 12 divisors (see below), whose sum is σ = 1219131760. Its totient is φ = 332490312.

The previous prime is 680813611. The next prime is 680813689. The reversal of 680813668 is 866318086.

It is a happy number.

It is a super-2 number, since 2×680813668² = 927014501071228448, which contains 22 as substring.

It is a hoax number, since the sum of its digits (46) coincides with the sum of the digits of its distinct prime factors.

It is an unprimeable number.

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, 1978938 + ... + 1979281.

Almost surely, 2^680813668 is an apocalyptic number.

It is an amenable number.

680813668 is a deficient number, since it is larger than the sum of its proper divisors (538318092).

680813668 is a wasteful number, since it uses less digits than its factorization.

680813668 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3958266 (or 3958264 counting only the distinct ones).

The product of its (nonzero) digits is 331776, while the sum is 46.

The square root of 680813668 is about 26092.4063282787. The cubic root of 680813668 is about 879.7165357669.

The spelling of 680813668 in words is "six hundred eighty million, eight hundred thirteen thousand, six hundred sixty-eight".