681000188 has 24 divisors (see below), whose sum is σ = 1342032384. Its totient is φ = 299559600.

The previous prime is 681000167. The next prime is 681000191. The reversal of 681000188 is 881000186.

It is a happy number.

It is a super-2 number, since 2×681000188² = 927522512112070688, which contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 248270 + ... + 250997.

It is an arithmetic number, because the mean of its divisors is an integer number (55918016).

Almost surely, 2^681000188 is an apocalyptic number.

It is an amenable number.

681000188 is a deficient number, since it is larger than the sum of its proper divisors (661032196).

681000188 is a wasteful number, since it uses less digits than its factorization.

681000188 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 499313 (or 499311 counting only the distinct ones).

The product of its (nonzero) digits is 3072, while the sum is 32.

The square root of 681000188 is about 26095.9803034874. The cubic root of 681000188 is about 879.7968659921.

The spelling of 681000188 in words is "six hundred eighty-one million, one hundred eighty-eight", and thus it is an aban number.