216864186 has 96 divisors (see below), whose sum is σ = 550556160. Its totient is φ = 55740960.

The previous prime is 216864169. The next prime is 216864199. The reversal of 216864186 is 681468612.

It is a Harshad number since it is a multiple of its sum of digits (42).

It is an unprimeable number.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 706245 + ... + 706551.

It is an arithmetic number, because the mean of its divisors is an integer number (5734960).

Almost surely, 2^216864186 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 216864186, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (275278080).

216864186 is an abundant number, since it is smaller than the sum of its proper divisors (333691974).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

216864186 is a wasteful number, since it uses less digits than its factorization.

216864186 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 480 (or 469 counting only the distinct ones).

The product of its digits is 110592, while the sum is 42.

The square root of 216864186 is about 14726.3093136060. The cubic root of 216864186 is about 600.7991074618.

The spelling of 216864186 in words is "two hundred sixteen million, eight hundred sixty-four thousand, one hundred eighty-six".