216622815 has 16 divisors (see below), whose sum is σ = 348604128. Its totient is φ = 114862976.

The previous prime is 216622801. The next prime is 216622831. The reversal of 216622815 is 518226612.

It is a cyclic number.

It is not a de Polignac number, because 216622815 - 2⁴ = 216622799 is a prime.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 39144 + ... + 44333.

It is an arithmetic number, because the mean of its divisors is an integer number (21787758).

Almost surely, 2^216622815 is an apocalyptic number.

216622815 is a deficient number, since it is larger than the sum of its proper divisors (131981313).

216622815 is a wasteful number, since it uses less digits than its factorization.

216622815 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 83658.

The product of its digits is 11520, while the sum is 33.

The square root of 216622815 is about 14718.1118014506. Note that the first 3 decimals coincide. The cubic root of 216622815 is about 600.5761271743.

The spelling of 216622815 in words is "two hundred sixteen million, six hundred twenty-two thousand, eight hundred fifteen".