216031706 has 24 divisors (see below), whose sum is σ = 364888692. Its totient is φ = 95796800.

The previous prime is 216031681. The next prime is 216031721. The reversal of 216031706 is 607130612.

It can be written as a sum of positive squares in 2 ways, for example, as 168766081 + 47265625 = 12991^2 + 6875^2 .

It is a Curzon number.

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 11 ways as a sum of consecutive naturals, for example, 965 + ... + 20808.

Almost surely, 2^216031706 is an apocalyptic number.

216031706 is a deficient number, since it is larger than the sum of its proper divisors (148856986).

216031706 is a wasteful number, since it uses less digits than its factorization.

216031706 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 21838 (or 21827 counting only the distinct ones).

The product of its (nonzero) digits is 1512, while the sum is 26.

The square root of 216031706 is about 14698.0170771434. The cubic root of 216031706 is about 600.0293559711.

The spelling of 216031706 in words is "two hundred sixteen million, thirty-one thousand, seven hundred six".