216109284 has 12 divisors (see below), whose sum is σ = 504255024. Its totient is φ = 72036424.

The previous prime is 216109261. The next prime is 216109301. The reversal of 216109284 is 482901612.

It is a tau number, because it is divible by the number of its divisors (12).

It is a Smith number, since the sum of its digits (33) coincides with the sum of the digits of its prime factors.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 9004542 + ... + 9004565.

It is an arithmetic number, because the mean of its divisors is an integer number (42021252).

Almost surely, 2^216109284 is an apocalyptic number.

It is an amenable number.

216109284 is an abundant number, since it is smaller than the sum of its proper divisors (288145740).

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

216109284 is a wasteful number, since it uses less digits than its factorization.

216109284 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 18009114 (or 18009112 counting only the distinct ones).

The product of its (nonzero) digits is 6912, while the sum is 33.

The square root of 216109284 is about 14700.6559037344. The cubic root of 216109284 is about 600.1011718284.

The spelling of 216109284 in words is "two hundred sixteen million, one hundred nine thousand, two hundred eighty-four".