216494208 has 320 divisors, whose sum is σ = 780014400. Its totient is φ = 58226688.

The previous prime is 216494183. The next prime is 216494221. The reversal of 216494208 is 802494612.

216494208 is a `hidden beast` number, since 2 + 1 + 649 + 4 + 2 + 0 + 8 = 666.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is an unprimeable number.

It is a polite number, since it can be written in 39 ways as a sum of consecutive naturals, for example, 1378866 + ... + 1379022.

It is an arithmetic number, because the mean of its divisors is an integer number (2437545).

Almost surely, 2^216494208 is an apocalyptic number.

216494208 is a gapful number since it is divisible by the number (28) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 216494208, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (390007200).

216494208 is an abundant number, since it is smaller than the sum of its proper divisors (563520192).

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

216494208 is a wasteful number, since it uses less digits than its factorization.

216494208 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 209 (or 188 counting only the distinct ones).

The product of its (nonzero) digits is 27648, while the sum is 36.

The square root of 216494208 is about 14713.7421480737. The cubic root of 216494208 is about 600.4572514467.

The spelling of 216494208 in words is "two hundred sixteen million, four hundred ninety-four thousand, two hundred eight".