220979766 has 32 divisors (see below), whose sum is σ = 531682560. Its totient is φ = 59813856.

The previous prime is 220979743. The next prime is 220979779. The reversal of 220979766 is 667979022.

220979766 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It is a Curzon number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 137661 + ... + 139256.

It is an arithmetic number, because the mean of its divisors is an integer number (16615080).

Almost surely, 2^220979766 is an apocalyptic number.

220979766 is an abundant number, since it is smaller than the sum of its proper divisors (310702794).

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

220979766 is a wasteful number, since it uses less digits than its factorization.

220979766 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 276948.

The product of its (nonzero) digits is 571536, while the sum is 48.

The square root of 220979766 is about 14865.3881886751. The cubic root of 220979766 is about 604.5759075113.

The spelling of 220979766 in words is "two hundred twenty million, nine hundred seventy-nine thousand, seven hundred sixty-six".