216229790 has 64 divisors (see below), whose sum is σ = 455777280. Its totient is φ = 72334080.

The previous prime is 216229787. The next prime is 216229807. The reversal of 216229790 is 97922612.

It is a Curzon number.

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 31 ways as a sum of consecutive naturals, for example, 690674 + ... + 690986.

It is an arithmetic number, because the mean of its divisors is an integer number (7121520).

Almost surely, 2^216229790 is an apocalyptic number.

216229790 is an abundant number, since it is smaller than the sum of its proper divisors (239547490).

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

216229790 is a wasteful number, since it uses less digits than its factorization.

216229790 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 537.

The product of its (nonzero) digits is 27216, while the sum is 38.

The square root of 216229790 is about 14704.7539931819. The cubic root of 216229790 is about 600.2126931123.

The spelling of 216229790 in words is "two hundred sixteen million, two hundred twenty-nine thousand, seven hundred ninety".