243128560 has 120 divisors (see below), whose sum is σ = 636588720. Its totient is φ = 85819392.

The previous prime is 243128551. The next prime is 243128569. The reversal of 243128560 is 65821342.

It is an interprime number because it is at equal distance from previous prime (243128551) and next prime (243128569).

It is a super-2 number, since 2×243128560² = 118222993375347200, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (243128569) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 2506432 + ... + 2506528.

It is an arithmetic number, because the mean of its divisors is an integer number (5304906).

Almost surely, 2^243128560 is an apocalyptic number.

243128560 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 243128560, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (318294360).

243128560 is an abundant number, since it is smaller than the sum of its proper divisors (393460160).

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

243128560 is a wasteful number, since it uses less digits than its factorization.

243128560 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 243 (or 140 counting only the distinct ones).

The product of its (nonzero) digits is 11520, while the sum is 31.

The square root of 243128560 is about 15592.5802867903. The cubic root of 243128560 is about 624.1351750765.

The spelling of 243128560 in words is "two hundred forty-three million, one hundred twenty-eight thousand, five hundred sixty".