231813072 has 120 divisors (see below), whose sum is σ = 688001600. Its totient is φ = 72658944.

The previous prime is 231813047. The next prime is 231813077. The reversal of 231813072 is 270318132.

231813072 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (231813077) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 527829 + ... + 528267.

Almost surely, 2^231813072 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 231813072, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (344000800).

231813072 is an abundant number, since it is smaller than the sum of its proper divisors (456188528).

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

231813072 is a wasteful number, since it uses less digits than its factorization.

231813072 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 665 (or 656 counting only the distinct ones).

The product of its (nonzero) digits is 2016, while the sum is 27.

The square root of 231813072 is about 15225.4087629856. The cubic root of 231813072 is about 614.2982914729.

The spelling of 231813072 in words is "two hundred thirty-one million, eight hundred thirteen thousand, seventy-two".