216234320 has 20 divisors (see below), whose sum is σ = 502744980. Its totient is φ = 86493696.

The previous prime is 216234289. The next prime is 216234349. The reversal of 216234320 is 23432612.

216234320 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 2 ways, for example, as 86638864 + 129595456 = 9308^2 + 11384^2 .

It is a tau number, because it is divible by the number of its divisors (20).

It is a super-2 number, since 2×216234320² = 93514562291724800, which contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1351385 + ... + 1351544.

It is an arithmetic number, because the mean of its divisors is an integer number (25137249).

Almost surely, 2^216234320 is an apocalyptic number.

216234320 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

216234320 is an abundant number, since it is smaller than the sum of its proper divisors (286510660).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

216234320 is a wasteful number, since it uses less digits than its factorization.

216234320 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2702942 (or 2702936 counting only the distinct ones).

The product of its (nonzero) digits is 1728, while the sum is 23.

The square root of 216234320 is about 14704.9080241938. The cubic root of 216234320 is about 600.2168845553.

Adding to 216234320 its reverse (23432612), we get a palindrome (239666932).

The spelling of 216234320 in words is "two hundred sixteen million, two hundred thirty-four thousand, three hundred twenty".