681909186 has 48 divisors (see below), whose sum is σ = 1629386496. Its totient is φ = 189562464.

The previous prime is 681909157. The next prime is 681909187.

681909186 is nontrivially palindromic in base 10.

It is not an unprimeable number, because it can be changed into a prime (681909187) 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 in 23 ways as a sum of consecutive naturals, for example, 20466 + ... + 42221.

It is an arithmetic number, because the mean of its divisors is an integer number (33945552).

Almost surely, 2^681909186 is an apocalyptic number.

681909186 is an abundant number, since it is smaller than the sum of its proper divisors (947477310).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

681909186 is a wasteful number, since it uses less digits than its factorization.

681909186 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 62743 (or 62736 counting only the distinct ones).

The product of its (nonzero) digits is 186624, while the sum is 48.

The square root of 681909186 is about 26113.3909326231. The cubic root of 681909186 is about 880.1881424517.

The spelling of 681909186 in words is "six hundred eighty-one million, nine hundred nine thousand, one hundred eighty-six".