216444771 has 16 divisors (see below), whose sum is σ = 321014400. Its totient is φ = 144136584.

The previous prime is 216444769. The next prime is 216444779. The reversal of 216444771 is 177444612.

It is a happy number.

216444771 is a `hidden beast` number, since 2 + 1 + 644 + 4 + 7 + 7 + 1 = 666.

It is not a de Polignac number, because 216444771 - 2¹ = 216444769 is a prime.

It is not an unprimeable number, because it can be changed into a prime (216444779) by changing a digit.

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 15 ways as a sum of consecutive naturals, for example, 23580 + ... + 31446.

It is an arithmetic number, because the mean of its divisors is an integer number (20063400).

Almost surely, 2^216444771 is an apocalyptic number.

216444771 is a deficient number, since it is larger than the sum of its proper divisors (104569629).

216444771 is a wasteful number, since it uses less digits than its factorization.

216444771 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8895 (or 8889 counting only the distinct ones).

The product of its digits is 37632, while the sum is 36.

The square root of 216444771 is about 14712.0620920386. The cubic root of 216444771 is about 600.4115426565.

The spelling of 216444771 in words is "two hundred sixteen million, four hundred forty-four thousand, seven hundred seventy-one".