216686830 has 32 divisors (see below), whose sum is σ = 411334560. Its totient is φ = 81959040.

The previous prime is 216686819. The next prime is 216686831. The reversal of 216686830 is 38686612.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (216686831) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 193432 + ... + 194548.

It is an arithmetic number, because the mean of its divisors is an integer number (12854205).

Almost surely, 2^216686830 is an apocalyptic number.

216686830 is a deficient number, since it is larger than the sum of its proper divisors (194647730).

216686830 is a wasteful number, since it uses less digits than its factorization.

216686830 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2164.

The product of its (nonzero) digits is 82944, while the sum is 40.

The square root of 216686830 is about 14720.2863423236. The cubic root of 216686830 is about 600.6352808301.

The spelling of 216686830 in words is "two hundred sixteen million, six hundred eighty-six thousand, eight hundred thirty".