216703385 has 8 divisors (see below), whose sum is σ = 260214216. Its totient is φ = 173249280.

The previous prime is 216703367. The next prime is 216703391. The reversal of 216703385 is 583307612.

216703385 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 4 ways, for example, as 59552089 + 157151296 = 7717^2 + 12536^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 216703385 - 2²² = 212509081 is a prime.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 5264 + ... + 21473.

It is an arithmetic number, because the mean of its divisors is an integer number (32526777).

Almost surely, 2^216703385 is an apocalyptic number.

It is an amenable number.

216703385 is a deficient number, since it is larger than the sum of its proper divisors (43510831).

216703385 is a wasteful number, since it uses less digits than its factorization.

216703385 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 28363.

The product of its (nonzero) digits is 30240, while the sum is 35.

The square root of 216703385 is about 14720.8486508081. The cubic root of 216703385 is about 600.6505767356.

The spelling of 216703385 in words is "two hundred sixteen million, seven hundred three thousand, three hundred eighty-five".