216320344 has 16 divisors (see below), whose sum is σ = 406271520. Its totient is φ = 107981280.

The previous prime is 216320341. The next prime is 216320347. The reversal of 216320344 is 443023612.

It is an interprime number because it is at equal distance from previous prime (216320341) and next prime (216320347).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (216320341) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 17152 + ... + 26959.

It is an arithmetic number, because the mean of its divisors is an integer number (25391970).

Almost surely, 2^216320344 is an apocalyptic number.

It is an amenable number.

216320344 is a deficient number, since it is larger than the sum of its proper divisors (189951176).

216320344 is a wasteful number, since it uses less digits than its factorization.

216320344 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 44730 (or 44726 counting only the distinct ones).

The product of its (nonzero) digits is 3456, while the sum is 25.

The square root of 216320344 is about 14707.8327431338. The cubic root of 216320344 is about 600.2964683016.

Adding to 216320344 its reverse (443023612), we get a palindrome (659343956).

The spelling of 216320344 in words is "two hundred sixteen million, three hundred twenty thousand, three hundred forty-four".