216971776 has 40 divisors (see below), whose sum is σ = 495459360. Its totient is φ = 92986368.

The previous prime is 216971767. The next prime is 216971791. The reversal of 216971776 is 677179612.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 26686 + ... + 33853.

It is an arithmetic number, because the mean of its divisors is an integer number (12386484).

Almost surely, 2^216971776 is an apocalyptic number.

It is an amenable number.

216971776 is an abundant number, since it is smaller than the sum of its proper divisors (278487584).

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

216971776 is an frugal number, since it uses more digits than its factorization.

216971776 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 60564 (or 60548 counting only the distinct ones).

The product of its digits is 222264, while the sum is 46.

The square root of 216971776 is about 14729.9618465222. The cubic root of 216971776 is about 600.8984465773.

The spelling of 216971776 in words is "two hundred sixteen million, nine hundred seventy-one thousand, seven hundred seventy-six".