216981704 has 32 divisors (see below), whose sum is σ = 422582400. Its totient is φ = 104372160.

The previous prime is 216981689. The next prime is 216981707. The reversal of 216981704 is 407189612.

216981704 is digitally balanced in base 2 and base 3, because in such bases it contains all the possibile digits an equal number of times.

It is not an unprimeable number, because it can be changed into a prime (216981707) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 17294 + ... + 27074.

It is an arithmetic number, because the mean of its divisors is an integer number (13205700).

Almost surely, 2^216981704 is an apocalyptic number.

It is an amenable number.

216981704 is a deficient number, since it is larger than the sum of its proper divisors (205600696).

216981704 is a wasteful number, since it uses less digits than its factorization.

216981704 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9893 (or 9889 counting only the distinct ones).

The product of its (nonzero) digits is 24192, while the sum is 38.

The square root of 216981704 is about 14730.2988428613. The cubic root of 216981704 is about 600.9076115617.

The spelling of 216981704 in words is "two hundred sixteen million, nine hundred eighty-one thousand, seven hundred four".