216986616 has 96 divisors (see below), whose sum is σ = 732700800. Its totient is φ = 56358720.

The previous prime is 216986573. The next prime is 216986617. The reversal of 216986616 is 616689612.

216986616 is a `hidden beast` number, since 21 + 6 + 9 + 8 + 6 + 616 = 666.

It is a nude number because it is divisible by every one of its digits.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (216986617) 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 23 ways as a sum of consecutive naturals, for example, 14026 + ... + 25113.

It is an arithmetic number, because the mean of its divisors is an integer number (7632300).

Almost surely, 2^216986616 is an apocalyptic number.

It is an amenable number.

216986616 is an abundant number, since it is smaller than the sum of its proper divisors (515714184).

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

216986616 is a wasteful number, since it uses less digits than its factorization.

216986616 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 39169 (or 39162 counting only the distinct ones).

The product of its digits is 186624, while the sum is 45.

The square root of 216986616 is about 14730.4655730903. The cubic root of 216986616 is about 600.9121459469.

The spelling of 216986616 in words is "two hundred sixteen million, nine hundred eighty-six thousand, six hundred sixteen".