216493784 has 16 divisors (see below), whose sum is σ = 437151120. Its totient is φ = 99920160.

The previous prime is 216493763. The next prime is 216493811. The reversal of 216493784 is 487394612.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1040732 + ... + 1040939.

It is an arithmetic number, because the mean of its divisors is an integer number (27321945).

Almost surely, 2^216493784 is an apocalyptic number.

It is an amenable number.

216493784 is an abundant number, since it is smaller than the sum of its proper divisors (220657336).

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

216493784 is a wasteful number, since it uses less digits than its factorization.

216493784 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2081690 (or 2081686 counting only the distinct ones).

The product of its digits is 290304, while the sum is 44.

The square root of 216493784 is about 14713.7277397674. The cubic root of 216493784 is about 600.4568594515.

The spelling of 216493784 in words is "two hundred sixteen million, four hundred ninety-three thousand, seven hundred eighty-four".