216115290 has 80 divisors (see below), whose sum is σ = 583494912. Its totient is φ = 57394656.

The previous prime is 216115247. The next prime is 216115297. The reversal of 216115290 is 92511612.

216115290 is a `hidden beast` number, since 21 + 611 + 5 + 29 + 0 = 666.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (216115297) 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 39 ways as a sum of consecutive naturals, for example, 296907 + ... + 297633.

Almost surely, 2^216115290 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 216115290, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (291747456).

216115290 is an abundant number, since it is smaller than the sum of its proper divisors (367379622).

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

216115290 is a wasteful number, since it uses less digits than its factorization.

216115290 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1113 (or 1104 counting only the distinct ones).

The product of its (nonzero) digits is 1080, while the sum is 27.

The square root of 216115290 is about 14700.8601789147. The cubic root of 216115290 is about 600.1067310130.

The spelling of 216115290 in words is "two hundred sixteen million, one hundred fifteen thousand, two hundred ninety".