680807999 has 4 divisors (see below), whose sum is σ = 681426336. Its totient is φ = 680189664.

The previous prime is 680807951. The next prime is 680808013. The reversal of 680807999 is 999708086.

680807999 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-680807999 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (680807299) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 307514 + ... + 309719.

It is an arithmetic number, because the mean of its divisors is an integer number (170356584).

Almost surely, 2^680807999 is an apocalyptic number.

680807999 is a deficient number, since it is larger than the sum of its proper divisors (618337).

680807999 is a wasteful number, since it uses less digits than its factorization.

680807999 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 618336.

The product of its (nonzero) digits is 1959552, while the sum is 56.

The square root of 680807999 is about 26092.2976949137. The cubic root of 680807999 is about 879.7140940185.

The spelling of 680807999 in words is "six hundred eighty million, eight hundred seven thousand, nine hundred ninety-nine".