216666672 has 40 divisors (see below), whose sum is σ = 574854576. Its totient is φ = 70269696.

The previous prime is 216666661. The next prime is 216666691. The reversal of 216666672 is 276666612.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 59223 + ... + 62774.

Almost surely, 2^216666672 is an apocalyptic number.

It is an amenable number.

216666672 is an abundant number, since it is smaller than the sum of its proper divisors (358187904).

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

216666672 is a wasteful number, since it uses less digits than its factorization.

216666672 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 122045 (or 122039 counting only the distinct ones).

The product of its digits is 217728, while the sum is 42.

The square root of 216666672 is about 14719.6016250441. The cubic root of 216666672 is about 600.6166548997.

It can be divided in two parts, 21666667 and 2, that multiplied together give a palindrome (43333334).

The spelling of 216666672 in words is "two hundred sixteen million, six hundred sixty-six thousand, six hundred seventy-two".