243045640 has 16 divisors (see below), whose sum is σ = 546852780. Its totient is φ = 97218240.

The previous prime is 243045631. The next prime is 243045643. The reversal of 243045640 is 46540342.

It can be written as a sum of positive squares in 2 ways, for example, as 206152164 + 36893476 = 14358^2 + 6074^2 .

It is a junction number, because it is equal to n+sod(n) for n = 243045599 and 243045608.

It is not an unprimeable number, because it can be changed into a prime (243045643) by changing a digit.

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 3 ways as a sum of consecutive naturals, for example, 3038031 + ... + 3038110.

Almost surely, 2^243045640 is an apocalyptic number.

243045640 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

243045640 is an abundant number, since it is smaller than the sum of its proper divisors (303807140).

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

243045640 is a wasteful number, since it uses less digits than its factorization.

243045640 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6076152 (or 6076148 counting only the distinct ones).

The product of its (nonzero) digits is 11520, while the sum is 28.

The square root of 243045640 is about 15589.9211030717. The cubic root of 243045640 is about 624.0642123817.

Adding to 243045640 its reverse (46540342), we get a palindrome (289585982).

The spelling of 243045640 in words is "two hundred forty-three million, forty-five thousand, six hundred forty".