243573640 has 16 divisors (see below), whose sum is σ = 548040780. Its totient is φ = 97429440.

The previous prime is 243573619. The next prime is 243573641. The reversal of 243573640 is 46375342.

It can be written as a sum of positive squares in 2 ways, for example, as 240312004 + 3261636 = 15502^2 + 1806^2 .

It is a super-3 number, since 3×243573640³ (a number of 26 digits) contains 333 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 243573596 and 243573605.

It is not an unprimeable number, because it can be changed into a prime (243573641) 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 3 ways as a sum of consecutive naturals, for example, 3044631 + ... + 3044710.

Almost surely, 2^243573640 is an apocalyptic number.

243573640 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

243573640 is an abundant number, since it is smaller than the sum of its proper divisors (304467140).

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

243573640 is a wasteful number, since it uses less digits than its factorization.

243573640 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6089352 (or 6089348 counting only the distinct ones).

The product of its (nonzero) digits is 60480, while the sum is 34.

The square root of 243573640 is about 15606.8459337561. The cubic root of 243573640 is about 624.5157977740.

The spelling of 243573640 in words is "two hundred forty-three million, five hundred seventy-three thousand, six hundred forty".