243491616 has 96 divisors (see below), whose sum is σ = 741121920. Its totient is φ = 77628672.

The previous prime is 243491581. The next prime is 243491617. The reversal of 243491616 is 616194342.

243491616 is a `hidden beast` number, since 2 + 4 + 34 + 9 + 1 + 616 = 666.

It is a tau number, because it is divible by the number of its divisors (96).

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a nude number because it is divisible by every one of its digits.

It is not an unprimeable number, because it can be changed into a prime (243491617) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 13746 + ... + 25998.

It is an arithmetic number, because the mean of its divisors is an integer number (7720020).

Almost surely, 2^243491616 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 243491616, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (370560960).

243491616 is an abundant number, since it is smaller than the sum of its proper divisors (497630304).

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

243491616 is a wasteful number, since it uses less digits than its factorization.

243491616 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12295 (or 12281 counting only the distinct ones).

The product of its digits is 31104, while the sum is 36.

The square root of 243491616 is about 15604.2178913267. The cubic root of 243491616 is about 624.4456875123.

The spelling of 243491616 in words is "two hundred forty-three million, four hundred ninety-one thousand, six hundred sixteen".