216690044 has 12 divisors (see below), whose sum is σ = 379406664. Its totient is φ = 108288144.

The previous prime is 216690017. The next prime is 216690077. The reversal of 216690044 is 440096612.

It is a happy 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 3 ways as a sum of consecutive naturals, for example, 4982 + ... + 21405.

It is an arithmetic number, because the mean of its divisors is an integer number (31617222).

Almost surely, 2^216690044 is an apocalyptic number.

It is an amenable number.

216690044 is a deficient number, since it is larger than the sum of its proper divisors (162716620).

216690044 is a wasteful number, since it uses less digits than its factorization.

216690044 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 28444 (or 28442 counting only the distinct ones).

The product of its (nonzero) digits is 10368, while the sum is 32.

The square root of 216690044 is about 14720.3955109909. The cubic root of 216690044 is about 600.6382504495.

The spelling of 216690044 in words is "two hundred sixteen million, six hundred ninety thousand, forty-four".