211678716 has 12 divisors (see below), whose sum is σ = 493917032. Its totient is φ = 70559568.

The previous prime is 211678703. The next prime is 211678717. The reversal of 211678716 is 617876112.

It is a tau number, because it is divible by the number of its divisors (12).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (211678717) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 8819935 + ... + 8819958.

Almost surely, 2^211678716 is an apocalyptic number.

It is an amenable number.

211678716 is an abundant number, since it is smaller than the sum of its proper divisors (282238316).

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

211678716 is a wasteful number, since it uses less digits than its factorization.

211678716 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 17639900 (or 17639898 counting only the distinct ones).

The product of its digits is 28224, while the sum is 39.

The square root of 211678716 is about 14549.1826574554. The cubic root of 211678716 is about 595.9718280154.

The spelling of 211678716 in words is "two hundred eleven million, six hundred seventy-eight thousand, seven hundred sixteen".