216831770 has 32 divisors (see below), whose sum is σ = 414808128. Its totient is φ = 81324288.

The previous prime is 216831767. The next prime is 216831779. The reversal of 216831770 is 77138612.

It is a self number, because there is not a number n which added to its sum of digits gives 216831770.

It is not an unprimeable number, because it can be changed into a prime (216831779) 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, 45857 + ... + 50363.

It is an arithmetic number, because the mean of its divisors is an integer number (12962754).

Almost surely, 2^216831770 is an apocalyptic number.

216831770 is a deficient number, since it is larger than the sum of its proper divisors (197976358).

216831770 is a wasteful number, since it uses less digits than its factorization.

216831770 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4814.

The product of its (nonzero) digits is 14112, while the sum is 35.

The square root of 216831770 is about 14725.2086572653. The cubic root of 216831770 is about 600.7691709461.

The spelling of 216831770 in words is "two hundred sixteen million, eight hundred thirty-one thousand, seven hundred seventy".