681871692 has 24 divisors (see below), whose sum is σ = 1593403056. Its totient is φ = 226952128.

The previous prime is 681871679. The next prime is 681871699. The reversal of 681871692 is 296178186.

It is not an unprimeable number, because it can be changed into a prime (681871699) 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 7 ways as a sum of consecutive naturals, for example, 33843 + ... + 50090.

It is an arithmetic number, because the mean of its divisors is an integer number (66391794).

Almost surely, 2^681871692 is an apocalyptic number.

It is an amenable number.

681871692 is an abundant number, since it is smaller than the sum of its proper divisors (911531364).

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

681871692 is a wasteful number, since it uses less digits than its factorization.

681871692 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 84617 (or 84615 counting only the distinct ones).

The product of its digits is 290304, while the sum is 48.

The square root of 681871692 is about 26112.6730152239. The cubic root of 681871692 is about 880.1720101085.

The spelling of 681871692 in words is "six hundred eighty-one million, eight hundred seventy-one thousand, six hundred ninety-two".