216696387 has 16 divisors (see below), whose sum is σ = 305006720. Its totient is φ = 136847880.

The previous prime is 216696373. The next prime is 216696391. The reversal of 216696387 is 783696612.

It is not a de Polignac number, because 216696387 - 2¹² = 216692291 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (216696397) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 15312 + ... + 25842.

It is an arithmetic number, because the mean of its divisors is an integer number (19062920).

Almost surely, 2^216696387 is an apocalyptic number.

216696387 is a deficient number, since it is larger than the sum of its proper divisors (88310333).

216696387 is an equidigital number, since it uses as much as digits as its factorization.

216696387 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10591 (or 10553 counting only the distinct ones).

The product of its digits is 653184, while the sum is 48.

The square root of 216696387 is about 14720.6109587884. The cubic root of 216696387 is about 600.6441110652.

The spelling of 216696387 in words is "two hundred sixteen million, six hundred ninety-six thousand, three hundred eighty-seven".