685718188 has 48 divisors (see below), whose sum is σ = 1309996800. Its totient is φ = 312754176.

The previous prime is 685718179. The next prime is 685718249. The reversal of 685718188 is 881817586.

It is a happy number.

It is a Smith number, since the sum of its digits (52) coincides with the sum of the digits of its prime factors.

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 15 ways as a sum of consecutive naturals, for example, 1129381 + ... + 1129987.

It is an arithmetic number, because the mean of its divisors is an integer number (27291600).

Almost surely, 2^685718188 is an apocalyptic number.

685718188 is a gapful number since it is divisible by the number (68) formed by its first and last digit.

It is an amenable number.

685718188 is a deficient number, since it is larger than the sum of its proper divisors (624278612).

685718188 is a wasteful number, since it uses less digits than its factorization.

685718188 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1114 (or 1112 counting only the distinct ones).

The product of its digits is 860160, while the sum is 52.

The square root of 685718188 is about 26186.2213387117. The cubic root of 685718188 is about 881.8239493814.

The spelling of 685718188 in words is "six hundred eighty-five million, seven hundred eighteen thousand, one hundred eighty-eight".