216909822 has 32 divisors (see below), whose sum is σ = 440860320. Its totient is φ = 71139200.

The previous prime is 216909773. The next prime is 216909827. The reversal of 216909822 is 228909612.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (216909827) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 103804 + ... + 105872.

It is an arithmetic number, because the mean of its divisors is an integer number (13776885).

Almost surely, 2^216909822 is an apocalyptic number.

216909822 is an abundant number, since it is smaller than the sum of its proper divisors (223950498).

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

216909822 is a wasteful number, since it uses less digits than its factorization.

216909822 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2348.

The product of its (nonzero) digits is 31104, while the sum is 39.

The square root of 216909822 is about 14727.8587038306. The cubic root of 216909822 is about 600.8412477303.

The spelling of 216909822 in words is "two hundred sixteen million, nine hundred nine thousand, eight hundred twenty-two".