216383784 has 16 divisors (see below), whose sum is σ = 540959520. Its totient is φ = 72127920.

The previous prime is 216383777. The next prime is 216383801. The reversal of 216383784 is 487383612.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 4507972 + ... + 4508019.

It is an arithmetic number, because the mean of its divisors is an integer number (33809970).

Almost surely, 2^216383784 is an apocalyptic number.

216383784 is a gapful number since it is divisible by the number (24) formed by its first and last digit.

It is an amenable number.

216383784 is an abundant number, since it is smaller than the sum of its proper divisors (324575736).

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

216383784 is a wasteful number, since it uses less digits than its factorization.

216383784 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9016000 (or 9015996 counting only the distinct ones).

The product of its digits is 193536, while the sum is 42.

The square root of 216383784 is about 14709.9892590036. The cubic root of 216383784 is about 600.3551453004.

The spelling of 216383784 in words is "two hundred sixteen million, three hundred eighty-three thousand, seven hundred eighty-four".