216135444 has 48 divisors (see below), whose sum is σ = 585823616. Its totient is φ = 60739200.

The previous prime is 216135443. The next prime is 216135449. The reversal of 216135444 is 444531612.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (216135443) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 15967 + ... + 26214.

Almost surely, 2^216135444 is an apocalyptic number.

It is an amenable number.

216135444 is an abundant number, since it is smaller than the sum of its proper divisors (369688172).

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

216135444 is a wasteful number, since it uses less digits than its factorization.

216135444 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 42256 (or 42254 counting only the distinct ones).

The product of its digits is 11520, while the sum is 30.

The square root of 216135444 is about 14701.5456330278. The cubic root of 216135444 is about 600.1253849070.

The spelling of 216135444 in words is "two hundred sixteen million, one hundred thirty-five thousand, four hundred forty-four".