216766770 has 64 divisors (see below), whose sum is σ = 572655744. Its totient is φ = 52075520.

The previous prime is 216766769. The next prime is 216766811. The reversal of 216766770 is 77667612.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 34384 + ... + 40196.

It is an arithmetic number, because the mean of its divisors is an integer number (8947746).

Almost surely, 2^216766770 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 216766770, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (286327872).

216766770 is an abundant number, since it is smaller than the sum of its proper divisors (355888974).

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

216766770 is a wasteful number, since it uses less digits than its factorization.

216766770 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5947.

The product of its (nonzero) digits is 148176, while the sum is 42.

The square root of 216766770 is about 14723.0013923792. The cubic root of 216766770 is about 600.7091337742.

The spelling of 216766770 in words is "two hundred sixteen million, seven hundred sixty-six thousand, seven hundred seventy".