243545720 has 32 divisors (see below), whose sum is σ = 597795120. Its totient is φ = 88561920.

The previous prime is 243545717. The next prime is 243545747. The reversal of 243545720 is 27545342.

It is a super-3 number, since 3×243545720³ (a number of 26 digits) contains 333 as substring.

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, 276317 + ... + 277196.

Almost surely, 2^243545720 is an apocalyptic number.

243545720 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

243545720 is an abundant number, since it is smaller than the sum of its proper divisors (354249400).

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

243545720 is a wasteful number, since it uses less digits than its factorization.

243545720 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 553535 (or 553531 counting only the distinct ones).

The product of its (nonzero) digits is 33600, while the sum is 32.

The square root of 243545720 is about 15605.9514288620. The cubic root of 243545720 is about 624.4919348369.

The spelling of 243545720 in words is "two hundred forty-three million, five hundred forty-five thousand, seven hundred twenty".