216809466 has 32 divisors (see below), whose sum is σ = 460660608. Its totient is φ = 67791360.

The previous prime is 216809419. The next prime is 216809491. The reversal of 216809466 is 664908612.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 28531 + ... + 35321.

It is an arithmetic number, because the mean of its divisors is an integer number (14395644).

Almost surely, 2^216809466 is an apocalyptic number.

216809466 is an abundant number, since it is smaller than the sum of its proper divisors (243851142).

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

216809466 is a wasteful number, since it uses less digits than its factorization.

216809466 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7126.

The product of its (nonzero) digits is 124416, while the sum is 42.

The square root of 216809466 is about 14724.4512970773. The cubic root of 216809466 is about 600.7485712357.

The spelling of 216809466 in words is "two hundred sixteen million, eight hundred nine thousand, four hundred sixty-six".