680672866 has 4 divisors (see below), whose sum is σ = 1021009302. Its totient is φ = 340336432.

The previous prime is 680672851. The next prime is 680672869. The reversal of 680672866 is 668276086.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in only one way, i.e., 675740025 + 4932841 = 25995^2 + 2221^2 .

It is not an unprimeable number, because it can be changed into a prime (680672869) 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 as a sum of consecutive naturals, namely, 170168215 + ... + 170168218.

Almost surely, 2^680672866 is an apocalyptic number.

680672866 is a deficient number, since it is larger than the sum of its proper divisors (340336436).

680672866 is a wasteful number, since it uses less digits than its factorization.

680672866 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 340336435.

The product of its (nonzero) digits is 1161216, while the sum is 49.

The square root of 680672866 is about 26089.7080474274. The cubic root of 680672866 is about 879.6558856000.

The spelling of 680672866 in words is "six hundred eighty million, six hundred seventy-two thousand, eight hundred sixty-six".