243320240 has 80 divisors (see below), whose sum is σ = 598461696. Its totient is φ = 91852800.

The previous prime is 243320221. The next prime is 243320257. The reversal of 243320240 is 42023342.

It is a tau number, because it is divible by the number of its divisors (80).

It is a Harshad number since it is a multiple of its sum of digits (20).

It is an unprimeable number.

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, 100484 + ... + 102876.

Almost surely, 2^243320240 is an apocalyptic number.

243320240 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 243320240, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (299230848).

243320240 is an abundant number, since it is smaller than the sum of its proper divisors (355141456).

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

243320240 is a wasteful number, since it uses less digits than its factorization.

243320240 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2478 (or 2472 counting only the distinct ones).

The product of its (nonzero) digits is 1152, while the sum is 20.

The square root of 243320240 is about 15598.7255889704. The cubic root of 243320240 is about 624.2991525276.

Adding to 243320240 its reverse (42023342), we get a palindrome (285343582).

The spelling of 243320240 in words is "two hundred forty-three million, three hundred twenty thousand, two hundred forty".