216446813 has 8 divisors (see below), whose sum is σ = 246390336. Its totient is φ = 188214400.

The previous prime is 216446777. The next prime is 216446833. The reversal of 216446813 is 318644612.

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

It is a de Polignac number, because none of the positive numbers 2^k-216446813 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (216446833) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 427508 + ... + 428013.

It is an arithmetic number, because the mean of its divisors is an integer number (30798792).

Almost surely, 2^216446813 is an apocalyptic number.

216446813 is a gapful number since it is divisible by the number (23) formed by its first and last digit.

It is an amenable number.

216446813 is a deficient number, since it is larger than the sum of its proper divisors (29943523).

216446813 is a wasteful number, since it uses less digits than its factorization.

216446813 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 855555.

The product of its digits is 27648, while the sum is 35.

The square root of 216446813 is about 14712.1314907120. The cubic root of 216446813 is about 600.4134308003.

The spelling of 216446813 in words is "two hundred sixteen million, four hundred forty-six thousand, eight hundred thirteen".