216912444 has 48 divisors (see below), whose sum is σ = 583016448. Its totient is φ = 61483968.

The previous prime is 216912407. The next prime is 216912457. The reversal of 216912444 is 444219612.

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

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 502 + ... + 20834.

It is an arithmetic number, because the mean of its divisors is an integer number (12146176).

Almost surely, 2^216912444 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 216912444, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (291508224).

216912444 is an abundant number, since it is smaller than the sum of its proper divisors (366104004).

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

216912444 is a wasteful number, since it uses less digits than its factorization.

216912444 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 20474 (or 20472 counting only the distinct ones).

The product of its digits is 13824, while the sum is 33.

The square root of 216912444 is about 14727.9477185384. The cubic root of 216912444 is about 600.8436687047.

The spelling of 216912444 in words is "two hundred sixteen million, nine hundred twelve thousand, four hundred forty-four".