218007685 has 32 divisors (see below), whose sum is σ = 315021312. Its totient is φ = 141599040.

The previous prime is 218007661. The next prime is 218007697. The reversal of 218007685 is 586700812.

218007685 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 218007685 - 2⁹ = 218007173 is a prime.

It is a super-3 number, since 3×218007685³ (a number of 26 digits) contains 333 as substring.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 84870 + ... + 87400.

It is an arithmetic number, because the mean of its divisors is an integer number (9844416).

Almost surely, 2^218007685 is an apocalyptic number.

It is an amenable number.

218007685 is a deficient number, since it is larger than the sum of its proper divisors (97013627).

218007685 is a wasteful number, since it uses less digits than its factorization.

218007685 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2673.

The product of its (nonzero) digits is 26880, while the sum is 37.

The square root of 218007685 is about 14765.0833048784. The cubic root of 218007685 is about 601.8532375501.

The spelling of 218007685 in words is "two hundred eighteen million, seven thousand, six hundred eighty-five".