243690320 has 40 divisors (see below), whose sum is σ = 567613224. Its totient is φ = 97298432.

The previous prime is 243690299. The next prime is 243690361. The reversal of 243690320 is 23096342.

It can be written as a sum of positive squares in 4 ways, for example, as 80656 + 243609664 = 284^2 + 15608^2 .

It is a tau number, because it is divible by the number of its divisors (40).

It is a congruent number.

It is an unprimeable number.

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 7 ways as a sum of consecutive naturals, for example, 46892 + ... + 51828.

Almost surely, 2^243690320 is an apocalyptic number.

243690320 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

243690320 is an abundant number, since it is smaller than the sum of its proper divisors (323922904).

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

243690320 is a wasteful number, since it uses less digits than its factorization.

243690320 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5567 (or 5561 counting only the distinct ones).

The product of its (nonzero) digits is 7776, while the sum is 29.

The square root of 243690320 is about 15610.5835893473. The cubic root of 243690320 is about 624.6155032414.

The spelling of 243690320 in words is "two hundred forty-three million, six hundred ninety thousand, three hundred twenty".