216878603 has 4 divisors (see below), whose sum is σ = 216929688. Its totient is φ = 216827520.

The previous prime is 216878591. The next prime is 216878609. The reversal of 216878603 is 306878612.

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 216878603 - 2¹⁰ = 216877579 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (216878609) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 18533 + ... + 27878.

It is an arithmetic number, because the mean of its divisors is an integer number (54232422).

Almost surely, 2^216878603 is an apocalyptic number.

216878603 is a deficient number, since it is larger than the sum of its proper divisors (51085).

216878603 is an equidigital number, since it uses as much as digits as its factorization.

216878603 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 51084.

The product of its (nonzero) digits is 96768, while the sum is 41.

The square root of 216878603 is about 14726.7988035418. The cubic root of 216878603 is about 600.8124207540.

Subtracting 216878603 from its reverse (306878612), we obtain a palindrome (90000009).

The spelling of 216878603 in words is "two hundred sixteen million, eight hundred seventy-eight thousand, six hundred three".