218107856 has 20 divisors (see below), whose sum is σ = 426689952. Its totient is φ = 107994336.

The previous prime is 218107853. The next prime is 218107913. The reversal of 218107856 is 658701812.

It is an alternating number because its digits alternate between even and odd.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (218107853) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 64526 + ... + 67821.

Almost surely, 2^218107856 is an apocalyptic number.

It is an amenable number.

218107856 is a deficient number, since it is larger than the sum of its proper divisors (208582096).

218107856 is a wasteful number, since it uses less digits than its factorization.

218107856 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 132458 (or 132452 counting only the distinct ones).

The product of its (nonzero) digits is 26880, while the sum is 38.

The square root of 218107856 is about 14768.4750736154. The cubic root of 218107856 is about 601.9454040399.

The spelling of 218107856 in words is "two hundred eighteen million, one hundred seven thousand, eight hundred fifty-six".