216444438 has 48 divisors (see below), whose sum is σ = 543978240. Its totient is φ = 60915888.

The previous prime is 216444427. The next prime is 216444443. The reversal of 216444438 is 834444612.

216444438 is a `hidden beast` number, since 2 + 1 + 644 + 4 + 4 + 3 + 8 = 666.

216444438 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It is a super-2 number, since 2×216444438² = 93696389482271688, which contains 22 as substring.

It is a Curzon number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 4378 + ... + 21261.

It is an arithmetic number, because the mean of its divisors is an integer number (11332880).

Almost surely, 2^216444438 is an apocalyptic number.

216444438 is an abundant number, since it is smaller than the sum of its proper divisors (327533802).

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

216444438 is a wasteful number, since it uses less digits than its factorization.

216444438 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 25721 (or 25718 counting only the distinct ones).

The product of its digits is 73728, while the sum is 36.

The square root of 216444438 is about 14712.0507747900. The cubic root of 216444438 is about 600.4112347456.

The spelling of 216444438 in words is "two hundred sixteen million, four hundred forty-four thousand, four hundred thirty-eight".