216898385 has 16 divisors (see below), whose sum is σ = 284567040. Its totient is φ = 157395840.

The previous prime is 216898361. The next prime is 216898399. The reversal of 216898385 is 583898612.

It is not a de Polignac number, because 216898385 - 2²⁴ = 200121169 is a prime.

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, 22229 + ... + 30461.

It is an arithmetic number, because the mean of its divisors is an integer number (17785440).

Almost surely, 2^216898385 is an apocalyptic number.

It is an amenable number.

216898385 is a deficient number, since it is larger than the sum of its proper divisors (67668655).

216898385 is a wasteful number, since it uses less digits than its factorization.

216898385 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8728.

The product of its digits is 829440, while the sum is 50.

The square root of 216898385 is about 14727.4704209515. The cubic root of 216898385 is about 600.8306873631.

The spelling of 216898385 in words is "two hundred sixteen million, eight hundred ninety-eight thousand, three hundred eighty-five".