243601640 has 32 divisors (see below), whose sum is σ = 549883080. Its totient is φ = 97124352.

The previous prime is 243601613. The next prime is 243601643. The reversal of 243601640 is 46106342.

It can be written as a sum of positive squares in 4 ways, for example, as 154902916 + 88698724 = 12446^2 + 9418^2 .

It is not an unprimeable number, because it can be changed into a prime (243601643) 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 7 ways as a sum of consecutive naturals, for example, 2792 + ... + 22248.

Almost surely, 2^243601640 is an apocalyptic number.

243601640 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

243601640 is an abundant number, since it is smaller than the sum of its proper divisors (306281440).

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

243601640 is a wasteful number, since it uses less digits than its factorization.

243601640 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 19781 (or 19777 counting only the distinct ones).

The product of its (nonzero) digits is 3456, while the sum is 26.

The square root of 243601640 is about 15607.7429502154. The cubic root of 243601640 is about 624.5397272549.

Adding to 243601640 its reverse (46106342), we get a palindrome (289707982).

The spelling of 243601640 in words is "two hundred forty-three million, six hundred one thousand, six hundred forty".