216364340 has 24 divisors (see below), whose sum is σ = 459474120. Its totient is φ = 85572608.

The previous prime is 216364333. The next prime is 216364349. The reversal of 216364340 is 43463612.

It can be written as a sum of positive squares in 4 ways, for example, as 4545424 + 211818916 = 2132^2 + 14554^2 .

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (216364349) 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, 58997 + ... + 62556.

It is an arithmetic number, because the mean of its divisors is an integer number (19144755).

Almost surely, 2^216364340 is an apocalyptic number.

216364340 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

216364340 is an abundant number, since it is smaller than the sum of its proper divisors (243109780).

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

216364340 is a wasteful number, since it uses less digits than its factorization.

216364340 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 121651 (or 121649 counting only the distinct ones).

The product of its (nonzero) digits is 10368, while the sum is 29.

The square root of 216364340 is about 14709.3283327282. The cubic root of 216364340 is about 600.3371623523.

The spelling of 216364340 in words is "two hundred sixteen million, three hundred sixty-four thousand, three hundred forty".