231228318 has 32 divisors (see below), whose sum is σ = 490291200. Its totient is φ = 72571680.

The previous prime is 231228317. The next prime is 231228331. The reversal of 231228318 is 813822132.

231228318 is digitally balanced in base 2, 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 (231228313) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 9918 + ... + 23681.

It is an arithmetic number, because the mean of its divisors is an integer number (15321600).

Almost surely, 2^231228318 is an apocalyptic number.

231228318 is an abundant number, since it is smaller than the sum of its proper divisors (259062882).

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

231228318 is a wasteful number, since it uses less digits than its factorization.

231228318 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 33672.

The product of its digits is 4608, while the sum is 30.

The square root of 231228318 is about 15206.1934092658. The cubic root of 231228318 is about 613.7813291845.

The spelling of 231228318 in words is "two hundred thirty-one million, two hundred twenty-eight thousand, three hundred eighteen".