243771720240 has 40 divisors (see below), whose sum is σ = 755692333488. Its totient is φ = 65005792000.

The previous prime is 243771720221. The next prime is 243771720259. The reversal of 243771720240 is 42027177342.

It is an interprime number because it is at equal distance from previous prime (243771720221) and next prime (243771720259).

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

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 507857511 + ... + 507857990.

Almost surely, 2^243771720240 is an apocalyptic number.

243771720240 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

243771720240 is an abundant number, since it is smaller than the sum of its proper divisors (511920613248).

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

243771720240 is a wasteful number, since it uses less digits than its factorization.

243771720240 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1015715517 (or 1015715511 counting only the distinct ones).

The product of its (nonzero) digits is 131712, while the sum is 39.

Adding to 243771720240 its reverse (42027177342), we get a palindrome (285798897582).

The spelling of 243771720240 in words is "two hundred forty-three billion, seven hundred seventy-one million, seven hundred twenty thousand, two hundred forty".