680891758 has 4 divisors (see below), whose sum is σ = 1021337640. Its totient is φ = 340445878.

The previous prime is 680891711. The next prime is 680891779. The reversal of 680891758 is 857198086.

680891758 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 super-2 number, since 2×680891758² = 927227172224661128, which contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 170222938 + ... + 170222941.

It is an arithmetic number, because the mean of its divisors is an integer number (255334410).

Almost surely, 2^680891758 is an apocalyptic number.

680891758 is a deficient number, since it is larger than the sum of its proper divisors (340445882).

680891758 is a wasteful number, since it uses less digits than its factorization.

680891758 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 340445881.

The product of its (nonzero) digits is 967680, while the sum is 52.

The square root of 680891758 is about 26093.9026977568. The cubic root of 680891758 is about 879.7501692661.

The spelling of 680891758 in words is "six hundred eighty million, eight hundred ninety-one thousand, seven hundred fifty-eight".