681707186 has 8 divisors (see below), whose sum is σ = 1024128684. Its totient is φ = 340330960.

The previous prime is 681707183. The next prime is 681707219.

681707186 is nontrivially palindromic in base 10.

It can be written as a sum of positive squares in 2 ways, for example, as 527574961 + 154132225 = 22969^2 + 12415^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is not an unprimeable number, because it can be changed into a prime (681707183) by changing a digit.

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, 259685 + ... + 262296.

Almost surely, 2^681707186 is an apocalyptic number.

681707186 is a deficient number, since it is larger than the sum of its proper divisors (342421498).

681707186 is a wasteful number, since it uses less digits than its factorization.

681707186 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 522636.

The product of its (nonzero) digits is 112896, while the sum is 44.

The square root of 681707186 is about 26109.5228987433. The cubic root of 681707186 is about 880.1012219997.

The spelling of 681707186 in words is "six hundred eighty-one million, seven hundred seven thousand, one hundred eighty-six".