231817728 has 80 divisors (see below), whose sum is σ = 634423680. Its totient is φ = 75165696.

The previous prime is 231817697. The next prime is 231817739. The reversal of 231817728 is 827718132.

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, 54793 + ... + 58871.

It is an arithmetic number, because the mean of its divisors is an integer number (7930296).

Almost surely, 2^231817728 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 231817728, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (317211840).

231817728 is an abundant number, since it is smaller than the sum of its proper divisors (402605952).

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

231817728 is an equidigital number, since it uses as much as digits as its factorization.

231817728 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4137 (or 4121 counting only the distinct ones).

The product of its digits is 37632, while the sum is 39.

The square root of 231817728 is about 15225.5616645167. The cubic root of 231817728 is about 614.3024042029.

The spelling of 231817728 in words is "two hundred thirty-one million, eight hundred seventeen thousand, seven hundred twenty-eight".