216560178 has 48 divisors (see below), whose sum is σ = 501710976. Its totient is φ = 67271040.

The previous prime is 216560177. The next prime is 216560191. The reversal of 216560178 is 871065612.

216560178 is a `hidden beast` number, since 21 + 6 + 560 + 1 + 78 = 666.

It is not an unprimeable number, because it can be changed into a prime (216560171) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 28083 + ... + 34953.

It is an arithmetic number, because the mean of its divisors is an integer number (10452312).

Almost surely, 2^216560178 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 216560178, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (250855488).

216560178 is an abundant number, since it is smaller than the sum of its proper divisors (285150798).

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

216560178 is a wasteful number, since it uses less digits than its factorization.

216560178 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6999 (or 6996 counting only the distinct ones).

The product of its (nonzero) digits is 20160, while the sum is 36.

The square root of 216560178 is about 14715.9837591647. The cubic root of 216560178 is about 600.5182355909.

The spelling of 216560178 in words is "two hundred sixteen million, five hundred sixty thousand, one hundred seventy-eight".