216886715 has 4 divisors (see below), whose sum is σ = 260264064. Its totient is φ = 173509368.

The previous prime is 216886699. The next prime is 216886739. The reversal of 216886715 is 517688612.

It is a happy number.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 216886715 - 2⁴ = 216886699 is a prime.

It is a Duffinian number.

It is an unprimeable number.

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, 21688667 + ... + 21688676.

It is an arithmetic number, because the mean of its divisors is an integer number (65066016).

Almost surely, 2^216886715 is an apocalyptic number.

216886715 is a deficient number, since it is larger than the sum of its proper divisors (43377349).

216886715 is an equidigital number, since it uses as much as digits as its factorization.

216886715 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 43377348.

The product of its digits is 161280, while the sum is 44.

The square root of 216886715 is about 14727.0742172368. The cubic root of 216886715 is about 600.8199114723.

The spelling of 216886715 in words is "two hundred sixteen million, eight hundred eighty-six thousand, seven hundred fifteen".