681188 has 12 divisors (see below), whose sum is σ = 1254960. Its totient is φ = 322632.

The previous prime is 681179. The next prime is 681221. The reversal of 681188 is 881186.

It is a happy number.

It is an unprimeable number.

681188 is an untouchable number, because it is not equal to the sum of proper divisors of any number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 4406 + ... + 4557.

It is an arithmetic number, because the mean of its divisors is an integer number (104580).

2⁶⁸¹¹⁸⁸ is an apocalyptic number.

It is an amenable number.

681188 is a deficient number, since it is larger than the sum of its proper divisors (573772).

681188 is a wasteful number, since it uses less digits than its factorization.

681188 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8986 (or 8984 counting only the distinct ones).

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

The square root of 681188 is about 825.3411415893. The cubic root of 681188 is about 87.9877737835.

The spelling of 681188 in words is "six hundred eighty-one thousand, one hundred eighty-eight".