216990234 has 48 divisors (see below), whose sum is σ = 494455104. Its totient is φ = 68640000.

The previous prime is 216990229. The next prime is 216990239. The reversal of 216990234 is 432099612.

It is an interprime number because it is at equal distance from previous prime (216990229) and next prime (216990239).

It is not an unprimeable number, because it can be changed into a prime (216990239) 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, 52234 + ... + 56234.

It is an arithmetic number, because the mean of its divisors is an integer number (10301148).

Almost surely, 2^216990234 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 216990234, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (247227552).

216990234 is an abundant number, since it is smaller than the sum of its proper divisors (277464870).

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

216990234 is a wasteful number, since it uses less digits than its factorization.

216990234 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4163 (or 4160 counting only the distinct ones).

The product of its (nonzero) digits is 23328, while the sum is 36.

The square root of 216990234 is about 14730.5883792875. The cubic root of 216990234 is about 600.9154857659.

The spelling of 216990234 in words is "two hundred sixteen million, nine hundred ninety thousand, two hundred thirty-four".