243208128 has 56 divisors (see below), whose sum is σ = 645200640. Its totient is φ = 80853760.

The previous prime is 243208117. The next prime is 243208139. The reversal of 243208128 is 821802342.

It is an interprime number because it is at equal distance from previous prime (243208117) and next prime (243208139).

It is a zygodrome in base 2.

It is a junction number, because it is equal to n+sod(n) for n = 243208095 and 243208104.

It is a congruent number.

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, 81283 + ... + 84221.

It is an arithmetic number, because the mean of its divisors is an integer number (11521440).

Almost surely, 2^243208128 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 243208128, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (322600320).

243208128 is an abundant number, since it is smaller than the sum of its proper divisors (401992512).

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

243208128 is a wasteful number, since it uses less digits than its factorization.

243208128 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3385 (or 3375 counting only the distinct ones).

The product of its (nonzero) digits is 6144, while the sum is 30.

The square root of 243208128 is about 15595.1315480184. The cubic root of 243208128 is about 624.2032539715.

The spelling of 243208128 in words is "two hundred forty-three million, two hundred eight thousand, one hundred twenty-eight".